add parameter: isTest to TiConfiguration

[marsishandsome]

Signed-off-by: marsishandsome [email protected]

What problem does this PR solve?

Currently RawKV and TxnKV cannot live together on the same TiKV cluster.
But all the test cases is running on the same TiKV cluster in ci.

What is changed and how it works?

So this PR try to provide a workaround to let ci pass.

Check List

Tests

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

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation
• Need to be included in the release note

[marsishandsome]

/run-all-tests

[marsishandsome]

/run-all-tests

[birdstorm]

LGTM