Custom CI/CD configuration file doesn't allow manually triggering pipeline
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### Summary
When [specifying a Custom CI/CD configuration file](https://git.nurocorinternal.com/help/ci/pipelines/settings#specify-a-custom-cicd-configuration-file), the Pipelines view does not act as if a pipeline file exists. It is not possible to manually trigger a pipeline and the view suggests that the user create one from a template. Attempting to do so triggers an error because the project recognizes that "This project's pipeline configuration is located outside this repository".
### Steps to reproduce
1. Create a project.
2. Navigate to "Settings... CI/CD... General Pipelines"
3. Edit "CI/CD configuration file" path to point to an external pipeline location.
4. Navigate to "Pipelines" view. View behaves as if there is no pipeline on the project.
5. Attempt to create a pipeline from any template. Results in an error.
### What is the current *bug* behavior?
- It isn't possible to manually trigger external pipeline even though it exists and has a workflow allowing "web" trigger.
- The UX results in an error loop by suggesting the user create a pipeline from a template even though this isn't possible when an external pipeline location is configured.
### What is the expected *correct* behavior?
- It should be possible to trigger the external pipeline from the "Pipelines" view as long as the workflow allows a "web" trigger.
- The view should not suggest a pipeline file be created from a template when this isn't a possible action when an external pipeline configuration is specified.
### Relevant logs and/or screenshots
#### Results of GitLab environment info
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<details>
<summary>Expand for output related to GitLab environment info</summary>
<pre>
System information
System: Ubuntu 20.04
Proxy: no
Current User: git
Using RVM: no
Ruby Version: 3.1.4p223
Gem Version: 3.5.7
Bundler Version:2.5.8
Rake Version: 13.0.6
Redis Version: 7.0.15
Sidekiq Version:7.1.6
Go Version: unknown
GitLab information
Version: 16.11.6-ee
Revision: 5b6a9df706f
Directory: /opt/gitlab/embedded/service/gitlab-rails
DB Adapter: PostgreSQL
DB Version: 13.13
URL: https://ourgitlabserver.com
HTTP Clone URL: https://ourgitlabserver.com/some-group/some-project.git
SSH Clone URL: git@ourgitlabserver.com:some-group/some-project.git
Elasticsearch: yes
Geo: no
Using LDAP: no
Using Omniauth: yes
Omniauth Providers:
GitLab Shell
Version: 14.35.0
Repository storages:
- default: unix:/var/opt/gitlab/gitaly/gitaly.socket
GitLab Shell path: /opt/gitlab/embedded/service/gitlab-shell
Gitaly
- default Address: unix:/var/opt/gitlab/gitaly/gitaly.socket
- default Version: 16.11.6
- default Git Version: 2.43.5
</pre>
</details>
#### Results of GitLab application Check
<!-- Input any relevant GitLab application check information if needed. -->
<details>
<summary>Expand for output related to the GitLab application check</summary>
<pre>
Checking GitLab subtasks ...
Checking GitLab Shell ...
GitLab Shell: ... GitLab Shell version >= 14.35.0 ? ... OK (14.35.0)
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Internal API available: OK
Redis available via internal API: OK
gitlab-shell self-check successful
Checking GitLab Shell ... Finished
Checking Gitaly ...
Gitaly: ... default ... OK
Checking Gitaly ... Finished
Checking Sidekiq ...
Sidekiq: ... Running? ... yes
Number of Sidekiq processes (cluster/worker) ... 1/1
Checking Sidekiq ... Finished
Checking Incoming Email ...
Incoming Email: ... Reply by email is disabled in config/gitlab.yml
Checking Incoming Email ... Finished
Checking LDAP ...
LDAP: ... LDAP is disabled in config/gitlab.yml
Checking LDAP ... Finished
Checking GitLab App ...
Database config exists? ... yes
Tables are truncated? ... skipped
All migrations up? ...
yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Cable config exists? ... yes
Resque config exists? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... yes
Systemd unit files or init script exist? ... skipped (omnibus-gitlab has neither init script nor systemd units)
Systemd unit files or init script up-to-date? ... skipped (omnibus-gitlab has neither init script nor systemd units)
Projects have namespace: ...
2/1 ... yes
3/14 ... yes
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5/310 ... yes
378/311 ... yes
76/312 ... yes
76/313 ... yes
10/315 ... yes
5/316 ... yes
398/317 ... yes
Redis version >= 6.2.14? ... yes
Ruby version >= 3.0.6 ? ... yes (3.1.4)
Git user has default SSH configuration? ... yes
Active users: ... 65
Is authorized keys file accessible? ... yes
GitLab configured to store new projects in hashed storage? ... yes
All projects are in hashed storage? ... yes
Elasticsearch version 7.x-8.x or OpenSearch version 1.x ... yes
Checking GitLab App ... Finished
Checking GitLab subtasks ... Finished
</pre>
</details>
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