Add property to restrict approver from approving their own run

[v-gayatrij]

Task name: ManualValidationV1

Description: Adding new property allowApproversToApproveTheirOwnRuns: boolean to restrict any approver from approving their own run

Documentation changes required: (Y/N) Y

Added unit tests: (Y/N) N

Attached related issue: (Y/N)

Checklist:

• Task version was bumped - please check instruction how to do it
• Checked that applied changes work as expected

[z00sts]

Added unit tests: (Y/N)

Since we're trying to eliminate task regressions by increasing autotest coverage - is it possible to add unit test for that case?

[v-gayatrij]

Added unit tests: (Y/N)

Since we're trying to eliminate task regressions by increasing autotest coverage - is it possible to add unit test for that case?

Added units tests along with ADO PR