feat: Enable 'All' namespaces view for non-admin users

[mathur07]

• Show 'All' option in namespace dropdown for all users with accessible namespaces
• Remove admin-only restriction from pipelines overview pages
• Non-admins see pipeline data scoped to their accessible namespaces
• Maintains security through existing RBAC permissions

Fixes: SRVKP-6766

[openshift-ci]

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[mathur07]

The solution is based on the understanding that :

• useK8sWatchResource<Project[]> only returns projects the current user can access
• All the pipeline queries (when ALL_NAMESPACES_KEY is selected) will be scoped to those accessible namespaces

[mathur07]

Hey @vikram-raj @lokanandaprabhu @pratap0007 and @aThorp96, I have this SRVKP-6766 that needs refinement. I was looking through the code and saw that it may be possible to implement it through the changes in this PR. I would need your advice to guide me if this change will be the correct fix to address "Show 'All' option in namespace dropdown for non-admin users with respective accessible namespaces". If not, then what is the correct approach that should be followed to achieve the desired states. Based on that we will be able to break the story into tasks and epics. TY!

[openshift-ci]

@mathur07: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/build	a3a1cbc	link	true	/test build
ci/prow/images	a3a1cbc	link	true	/test images

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[anwesha-palit-redhat]

@mathur07
Can you please add a before and after screen recording for the same ? Also please add unit tests, if possible.