storage: Force evict when downloading vector index files

[Lloyd-Pottiger]

What problem does this PR solve?

Issue Number: ref #9032

Problem Summary:

What is changed and how it works?

Pick https://github.com/tidbcloud/tiflash-cse/pull/253 and https://github.com/tidbcloud/tiflash-cse/pull/257

storage: Force evict when downloading vector index files

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[CalvinNeo]

lgtm

[JaySon-Huang]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CalvinNeo, JaySon-Huang

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-02 03:43:12.284623843 +0000 UTC m=+243116.802676768: ☑️ agreed by CalvinNeo.
• 2024-09-02 06:00:54.540123805 +0000 UTC m=+251379.058176730: ☑️ agreed by JaySon-Huang.