ddl: fix TypeBit default value (#9467)

[ti-chi-bot]

This is an automated cherry-pick of #9467

What problem does this PR solve?

Issue Number: close #9461

Problem Summary:

What is changed and how it works?

Fix two problems:

1. When the default value of TypeBit contains invalid characters (like 0x07 or 0x08), TiFlash fails to parse the schema JSON.
2. The default value of TypeBit is origin_default_bit_value.

ddl: fix TypeBit default value 

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• 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

Fix TiFlash fails to parse the table schema when the schema contains a TypeBit column with a default value that represents an invalid character.
修复当表里含 Bit 类型列并且带有表示非法字符的默认值时 TiFlash 无法解析表 schema 的问题。

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JaySon-Huang, Lloyd-Pottiger

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• OWNERS [JaySon-Huang,Lloyd-Pottiger]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-27 05:58:19.62621903 +0000 UTC m=+1804769.366642959: ☑️ agreed by JaySon-Huang.
• 2024-09-27 06:00:47.494192857 +0000 UTC m=+1804917.234616829: ☑️ agreed by Lloyd-Pottiger.

[Lloyd-Pottiger]

/retest

[Lloyd-Pottiger]

/cherry-pick release-7.1

[ti-chi-bot]

@Lloyd-Pottiger: failed to apply #9478 on top of branch "release-7.1":

[failed to git add conflicting files: exit status 128, failed to git commit: exit status 128]

In response to this:

/cherry-pick release-7.1

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