{portal}az portal dashboard: Revert name max length change

[cxznmhdcxz]

resolve #8491

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[azure-client-tools-bot-prd]

Hi @cxznmhdcxz,
Please write the description of changes which can be perceived by customers into HISTORY.rst.
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[azure-client-tools-bot-prd]

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[azure-client-tools-bot-prd]

Hi @cxznmhdcxz,
Since the current milestone time is less than 7 days, this pr will be reviewed in the next milestone.

[yonzhan]

Thank you for your contribution! We will review the pull request and get back to you soon.

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[kairu-ms]

why not change it to {3,64}

[cxznmhdcxz]

There is no pattern before bumping api version, and actually a dashboard could have a name longer then 64 characters, I think let the server check the name length?

[cxznmhdcxz]

changes included in #8730