tso/local: remove dc location and local_locator.go

[okJiang]

What problem does this PR solve?

Issue Number: Ref https://github.com/tikv/pd/issues/8802

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test

Release note

None.

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ti-chi-bot[bot]]

@okJiang: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-integration-realcluster-test	8b9c654d559167e9727cf88ba43071a7010d446d	link	true	/test pull-integration-realcluster-test

Full PR test history. Your PR dashboard.

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