[LW] Check for bad version in the right place

[Jolyon-S]

Goals (and why):

• Fix a bug that can occur on leader elections

Implementation Description (bullets):

• Move the check inside a block where we've already checked for mismatched leaders, and make it non-retriable.

Testing (What was existing testing like? What have you done to improve it?):

• Added yet another test in the integration tests.

Concerns (what feedback would you like?):
This fixes the issue, right?

Where should we start reviewing?:
LockWatchEventCacheImpl

Priority (whenever / two weeks / yesterday):
yesterday 🔥

[changelog-app]

Generate changelog in changelog/@unreleased

Type

• Feature
• Improvement
• Fix
• Break
• Deprecation
• Manual task
• Migration

Description

Fix LockWatch bug where a leader election could cause all requests to get updates to fail.

Check the box to generate changelog(s)

• Generate changelog entry

[svc-autorelease]

Released 0.252.1