dep(*): move diff package to the tiflow and get rid of the tidb-tools

[3AceShowHand]

What problem does this PR solve?

Issue Number: close #11163

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

`None`

[3AceShowHand]

/retest

[3AceShowHand]

/retest

[codecov]

Codecov Report

Attention: Patch coverage is 29.08199% with 1012 lines in your changes are missing coverage. Please review.

Project coverage is 57.2339%. Comparing base (4d89c24) to head (9f91f06).
Report is 1 commits behind head on master.

Additional details and impacted files

Components	Coverage Δ
cdc	61.2372% <29.0819%> (-0.7555%)	⬇️
dm	51.2001% <ø> (+0.0010%)	⬆️
engine	63.4091% <ø> (+0.0211%)	⬆️

Flag	Coverage Δ
unit	57.2339% <29.0819%> (-0.3174%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

@@               Coverage Diff                @@
##             master     #11164        +/-   ##
================================================
- Coverage   57.5512%   57.2339%   -0.3174%     
================================================
  Files           854        859         +5     
  Lines        126112     127538      +1426     
================================================
+ Hits          72579      72995       +416     
- Misses        48143      49128       +985     
- Partials       5390       5415        +25     

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: asddongmen, lance6716

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The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [asddongmen,lance6716]
• dm/OWNERS [lance6716]
• engine/OWNERS [lance6716]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-05-23 07:57:42.241285862 +0000 UTC m=+2331215.998421428: ☑️ agreed by lance6716.
• 2024-05-23 08:05:01.603913738 +0000 UTC m=+2331655.361049311: ☑️ agreed by asddongmen.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #11168.

[3AceShowHand]

/cherry-pick release-8.1

[ti-chi-bot]

@3AceShowHand: new pull request created to branch release-8.1: #11420.

In response to this:

/cherry-pick release-8.1

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