feat: add nginx server names hash override [BB-5512]

[kaustavb12]

Configuration Pull Request

Description

This PR adds support for optional configuration of nginx server_names_hash_bucket_size in case length of the hostname exceeds the default hash bucket size.

Supporting information

BB-5512

TODO

Cherry-pick to open-release/lilac.master and open-release/maple.master once this is merged.

Make sure that the following steps are done before merging:

• A SRE team member has approved the PR if it is code shared across multiple services and you don't own all of the services.
• Are you adding any new default values that need to be overridden when this change goes live? If so:
  • Update the appropriate internal repo (be sure to update for all our environments)
  • If you are updating a secure value rather than an internal one, file a SRE ticket with details.
  • Add an entry to the CHANGELOG.
• If you are making a complicated change, have you performed the proper testing specified on the Ops Ansible Testing Checklist? Adding a new variable does not require the full list (although testing on a sandbox is a great idea to ensure it links with your downstream code changes).
• Think about how this change will affect Open edX operators. Have you updated the wiki page for the next Open edX release?

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Thanks for the pull request, @kaustavb12! I've created OSPR-6454 to keep track of it in JIRA, where we prioritize reviews. Please note that it may take us up to several weeks or months to complete a review and merge your PR.

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[farhaanbukhsh]

👍

• ✅ I tested this, checked deployed changes on OCIM.
• ✅ I read through the code
• ❌ I checked for accessibility issues
• ✅ Includes documentation
• ❌ I made sure any change in configuration variables is reflected in the corresponding client's configuration-secure repository.

[natabene]

@kaustavb12 Thank you for your contribution. Please let me know once it is ready for our review.

[kaustavb12]

@natabene This PR is ready for your review

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