[fix][test] Fix flaky test LeaderElectionTest.revalidateLeaderWithinSameSession

[nikam14]

Fixes #21535

Motivation

The test should Provide Consistent Answer .Test revalidateLeaderWithinSameSession failed too many times.

Modifications

We are calling the method once store the object and check both the conditions . In this way at both conditions we are checking the same Object.

Verifying this change

• [x] Make sure that the change passes the CI checks.

Documentation

• [ ] doc
• [ ] doc-required
• [x] doc-not-needed
• [ ] doc-complete

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