[WEB-849] fix: issue detail identifier and workspace settings

[anmolsinghbhatia]

Issue:

1. After reloading the issue detail page, the project identifier is missing from the top header.
2. When reloading workspace settings, the settings sidebar only shows limited options, even though I have an admin user role.

Resolution:

1. Upon inspection, it was discovered that the observer was missing. Therefore, it was added to rectify the issue.
2. After looking into it, I've found that the observer was missing. So, we added it to fix the issue.

Issue link: [WEB-849]