ticdc: update worker-number to worker-count

[Oreoxmt]

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What is the related PR or file link(s)?

• This PR is translated from: ticdc: update worker-number to worker-count docs-cn#16354
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[Oreoxmt]

/cc @pepezzzz

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-01 08:27:21.164941726 +0000 UTC m=+1209729.912564836: ☑️ agreed by qiancai.

[Oreoxmt]

/approve

[ti-chi-bot]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #16765.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #16766.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.4: #16767.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #16768.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.6: #16769.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #16770.