br/pkg/lightning: make tidb version check more compitible

[glorv]

Cherry-pick #29500 to release-5.2

What problem does this PR solve?

TiDB version string can be customized by set the corresponding config field. So parse the result from select verson() to get tidb release version is not correct in some case.

What is changed and how it works?

• Try to exec select version() and parse the result as tidb version; If the query returns error, fallback to select version(); so we can still be compitible with MySQL/MariaDB.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  • Run dumpling and lightning(local backend) with TiDB playground v5.2.2 (server-version = 'Test-5.7.22'), both can detect tidb version correctly and export/import successfully
  • Run dumpling and lightning (tidb backend) with MySQL 5.7.22, both can export/import successfully.
• 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

Avoid version check failure when tidb version is customized.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• 3pointer
• lichunzhu

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[glorv]

/merge

[ti-chi-bot]

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

Commit hash: 68bf571

[glorv]

/run-check_dev

[glorv]

/run-check_dev

[glorv]

/run-check_dev

[glorv]

/merge

[ti-chi-bot]

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

Commit hash: f418b7f

[glorv]

/run-check_dev