All of these main bullet points should be a separate commit but they should be pushed together in the same commit queue task. The reason they should be pushed as separate commits is in the case of needing to revert one aspect of this entire task.

• Branch etc/evergreen.yml for 6.3
  • Change references from "master" to "v6.3" in etc/evergreen_yml_components/definitions.yml for:
    • enterprise module branch name
    • suffix in "get buildnumber" function
• Remove variants with "-wtdevelop" suffix from etc/evergreen.yml for v6.3

• Branch etc/evergreen_nightly.yml for 6.3
  • Copy the required variants (those starting with "!", except all feature flags) from etc/evergreen.yml to etc/evergreen_nightly.yml (don’t forget to add them under "buildvariants" key)
  • Change the include files at the top of the etc/evergreen_nightly.yml file as indicated by the comments here: https://github.com/mongodb/mongo/blob/9dc379a3461ca74dc448330d5f156bfe45d7eaeb/etc/evergreen_nightly.yml#L7-L12
  • Copy Commit Queue buildvariant from etc/evergreen.yml to etc/evergreen_nightly.yml
• Update filename suffixes in buildscripts/generate_version_expansions.py from "latest" to "v6.3-latest" for nightly builds for 6.3 branch

• Branch etc/system_perf.yml for 6.3
  • Change references from "master" to "v6.3" for:
    • enterprise module branch name * Remove renew_ssl_cert from etc/system_perf.yml for 6.3
  • renew_ssl_cert task and renew-ssl-cert variant
• Remove all feature flags variants from etc/system_perf.yml for 6.3

• Branch etc/perf.yml for 6.3
  • Change references from "master" to "v6.3" for:
    • enterprise module branch name