Set default value of spark.tispark.telemetry.enable as false (#2621)

[ti-chi-bot]

This is an automated cherry-pick of #2621

What problem does this PR solve?

Set default value of spark.tispark.telemetry.enable as false.

After that, tispark will not collect telemetry messages and send them.

What is changed and how it works?

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 update the tidb-ansible repository
• Need to be included in the release note

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• shiyuhang0
• zhangyangyu

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[shiyuhang0]

/run-all-tests