Rename remote development namespace agent auth mappings table and model
MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/181926+
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## Description
Spin off based on the following comment: https://gitlab.com/gitlab-org/gitlab/-/issues/513366#note_2317269171
As part of introducing the`organization_cluster_agent_mappings` table, we plan on renaming `remote_development_namespace_cluster_agent_mappings` to `namespace_cluster_agent_mappings` as the prefix adds no value and makes things long.
We plan on following the [zero downtime rename instructions](https://docs.gitlab.com/ee/development/database/rename_database_tables.html)
that will spill over two releases
## Acceptance Criteria
- [x] add table reference to `TABLES_TO_BE_RENAMED` hash (current release)
- [x] add a standard migration to rename the table and pay attention to the **important notes** section in the doc (next release)
- [x] modify the models to use the new table name (next release)
- [x] add a post migration to remove the view and finalize the rename (next release)
- [x] update the `TABLES_TO_BE_RENAMED` hash to remove the table reference (next release)
## Technical Requirements
## Design Requirements
## Impact Assessment
## User Story
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