Rename structure --> schema

[jhugman]

Relates to EXP-3938.

According to The Big O of Code Reviews, this is a O(1) change.

This PR touches a lot of files, but is a wholy mechanical change, done by search and replace and IDE changes.

Pull Request checklist

• Breaking changes: This PR follows our breaking change policy
  • This PR follows the breaking change policy:
    • This PR has no breaking API changes, or
    • There are corresponding PRs for our consumer applications that resolve the breaking changes and have been approved
• Quality: This PR builds and tests run cleanly
  • Note:
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    • If this pull request includes a breaking change, consider cutting a new release after merging.
• Tests: This PR includes thorough tests or an explanation of why it does not
• Changelog: This PR includes a changelog entry in CHANGELOG.md or an explanation of why it does not need one
  • Any breaking changes to Swift or Kotlin binding APIs are noted explicitly
• Dependencies: This PR follows our dependency management guidelines
  • Any new dependencies are accompanied by a summary of the due dilligence applied in selecting them.

Branch builds: add [firefox-android: branch-name] to the PR title.

[codecov-commenter]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (b518395) 27.35% compared to head (7e13a2f) 27.35%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
...port/nimbus-fml/src/intermediate_representation.rs	20.00%	4 Missing ⚠️
...ponents/support/nimbus-fml/src/client/inspector.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5959   +/-   ##
=======================================
  Coverage   27.35%   27.35%           
=======================================
  Files         379      379           
  Lines       48131    48131           
=======================================
  Hits        13166    13166           
  Misses      34965    34965           

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[jeddai]

r+wc

[jeddai]

Should this be validate_schema?