feat: Allow custom mount path for express middleware

[Hellslicer]

New Pull Request Checklist

• [X] I am not disclosing a vulnerability.
• [X] I am creating this PR in reference to an issue.

Issue Description

Express mount path can differ from actual base URL.

Closes: #1747

Approach

This PR adds a new option mountPath to customize mount path.

[parse-github-assistant[bot]]

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[uffizzi-cloud[bot]]

Uffizzi Ephemeral Environment deployment-25235

:watch: Updated May 14, 2023, 18:40 UTC

:cloud: https://app.uffizzi.com/github.com/parse-community/parse-dashboard/pull/2433

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[uffizzi-cloud[bot]]

Uffizzi Ephemeral Environment deployment-27981

:watch: Updated Jun 08, 2023, 19:29 UTC

:cloud: https://app.uffizzi.com/github.com/parse-community/parse-dashboard/pull/2433

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[mtrezza]

@dplewis would you wan to review this? not sure what all is needed for adding a new option, for CLI, validation, etc?

[uffizzi-cloud[bot]]

Uffizzi Ephemeral Environment deployment-47530

:watch: Updated Feb 29, 2024, 13:41 UTC

:cloud: https://app.uffizzi.com/github.com/parse-community/parse-dashboard/pull/2433

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[uffizzi-cloud[bot]]

Uffizzi Ephemeral Environment deployment-53600

:watch: Updated Jun 27, 2024, 23:24 UTC

:cloud: https://app.uffizzi.com/github.com/parse-community/parse-dashboard/pull/2433

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