store/tikv: remove Pessimistic option

[disksing]

Signed-off-by: disksing [email protected]

What problem does this PR solve?

Usage of Pessimistic option in store/tikv can be removed.

Part of #24302

What is changed and how it works?

What's Changed:

• add isPessimistic in KVTxn
• add method SetPessimistic to set up the checker
• update driver.tikvTxn to adapt.

Check List

Tests

• Unit test

Release note

• No release note

[AndreMouche]

LGTM

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• AndreMouche
• sticnarf

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[disksing]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 9aea207

[sre-bot]

Please follow PR Title Format:

• pkg [, pkg2, pkg3]: what's changed

Or if the count of mainly changed packages are more than 3, use

• *: what's changed

[ti-chi-bot]

/run-all-tests

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[ti-chi-bot]

/run-all-tests

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Silence the bot with the /merge cancel comment for consistent failures.

[ti-chi-bot]

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