Web IDE cannot open branches containing a '|' character

Summary

The WebIDE will fail to load a branch that contains a | in its name, displaying error Branch <START_NAME>%7<END_NAME> was not found in this project's repository.

The problem can be worked around by viewing an file and then starting the WebIDE from there.

This is very similar to #35473 (closed), which occurred with # character.

Steps to reproduce

1. Create a branch names yes|no
2. Switch to this branch on the main project page
3. Click the WebIDE button

• The WebIDe will start to load, then fail with the error above

Example Project

https://gitlab.com/wchandler/branch-name-pipe

What is the current bug behavior?

Branches with a pipe in their name cannot be loaded

What is the expected correct behavior?

All branches can be loaded in the WebIDE

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com

Results of GitLab environment info

Expand for output related to GitLab environment info

System information
System:
Proxy:          no
Current User:   git
Using RVM:      no
Ruby Version:   2.7.2p137
Gem Version:    3.1.4
Bundler Version:2.1.4
Rake Version:   13.0.3
Redis Version:  6.0.10
Git Version:    2.31.1
Sidekiq Version:5.2.9
Go Version:     unknown

GitLab information
Version:        13.11.1-ee
Revision:       557bbaae5b1
Directory:      /opt/gitlab/embedded/service/gitlab-rails
DB Adapter:     PostgreSQL
DB Version:     12.6
Elasticsearch:  yes
Geo:            no
Using LDAP:     no
Using Omniauth: yes
Omniauth Providers:

GitLab Shell
Version:        13.17.0
Repository storage paths:
- default:      /var/opt/gitlab/git-data/repositories
- remote:       /var/opt/gitlab/git-data/repositories
- nfs:  /mnt/git-data/repositories
GitLab Shell path:              /opt/gitlab/embedded/service/gitlab-shell
Git:            /opt/gitlab/embedded/bin/git

Results of GitLab application Check

Expand for output related to the GitLab application check

Checking GitLab subtasks ...
Checking GitLab Shell ...
GitLab Shell: ... GitLab Shell version >= 13.17.0 ? ... OK (13.17.0)
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
remote ... OK
nfs ... 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 ...
Git configured correctly? ... yes
Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... 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
Init script exists? ... skipped (omnibus-gitlab has no init script)
Init script up-to-date? ... skipped (omnibus-gitlab has no init script)
Projects have namespace: ...
1/400 ... yes
1/401 ... yes
1/402 ... yes
1/403 ... yes
25/404 ... yes
1/407 ... yes
25/408 ... yes
1/411 ... yes
1/416 ... yes
1/417 ... yes
1/419 ... yes
1/421 ... yes
1/422 ... yes
11/423 ... yes
8/424 ... yes
1/425 ... yes
1/426 ... yes
1/427 ... yes
1/428 ... yes
1/429 ... yes
1/430 ... yes
1/431 ... yes
1/432 ... yes
1/433 ... yes
1/434 ... yes
1/435 ... yes
1/436 ... yes
1/437 ... yes
3/438 ... yes
4/439 ... yes
1/440 ... yes
1/441 ... yes
3/442 ... yes
3/443 ... yes
47/444 ... yes
46/445 ... yes
1/446 ... yes
46/447 ... yes
46/448 ... yes
46/449 ... yes
46/450 ... yes
46/451 ... yes
46/452 ... yes
46/453 ... yes
46/454 ... yes
46/455 ... yes
46/456 ... yes
46/457 ... yes
1/458 ... yes
13/459 ... yes
20/460 ... yes
Redis version >= 5.0.0? ... yes
Ruby version >= 2.7.2 ? ... yes (2.7.2)
Git version >= 2.31.0 ? ... yes (2.31.1)
Git user has default SSH configuration? ... yes
Active users: ... 12
Is authorized keys file accessible? ... yes
Elasticsearch version 7.x (6.4 - 6.x deprecated to be removed in 13.8)? ... yes (7.9.1)
Checking GitLab App ... Finished
Checking GitLab subtasks ... Finished