[eas-cli] migrate off deprecated Build.project and BuildMutation.cancel

[tomek-agent]

Why

The deprecated-GraphQL-field usage dashboard shows eas-cli is the top reader of several @deprecated output fields. Build.project alone accounts for ~394k resolver hits and BuildMutation.cancel for the cancel path. Both have drop-in replacements with identical server behavior, so moving off them removes the largest safely-removable slice of eas-cli's deprecated-field traffic.

How

• BuildFragment selects app instead of project. On the server project: Project! and app: App! resolve through the same getAppAsync(), so this is a 1:1 swap. Because app is always an App, the Project union branch in getBuildLogsUrl collapses to the account/slug path.
• The build cancel command uses the cancelBuild(buildId:) mutation instead of the deprecated build(buildId:).cancel.
• generated.ts was regenerated against the committed schema so the diff is limited to these two documents (no unrelated schema refresh).

Intentionally left out:

• Build.runtimeVersion / Build.channel (the two next-biggest) are not safe to move yet: the deprecated string resolvers fall back to build metadata (runtime?.version ?? metadata.runtimeVersion) that the runtime / updateChannel objects don't, so switching would return null for older builds. Unblocking them needs a small server change to add the same fallback.
• Update.runtimeVersion is safe but threads through the update-formatting types (FormatUpdateParameter, UpdateToRepublish, RolloutUpdate); it belongs in its own PR.
• Account.users has no replacement ("No longer supported").

Test Plan

Regenerated GraphQL types, built eas-cli, and ran the affected unit suites (build cancel, build delete, workflow logs) — all green. The project → app swap is behavior-preserving: both fields share the server resolver and app is non-null, so the log-URL, internal-distribution-URL, and run-cache-path consumers receive the same values. CI passes.

[tomek-agent]

/changelog-entry chore migrate off deprecated GraphQL fields Build.project (use app) and BuildMutation.cancel (use cancelBuild)

[github-actions]

❌ It looks like a changelog entry is missing for this PR. Add it manually to CHANGELOG.md.
⏩ If this PR doesn't require a changelog entry, such as if it's an internal change that doesn't affect the user experience, you can add the "no changelog" label to the PR.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.05%. Comparing base (efc78f4) to head (bc21a22).

Files with missing lines	Patch %	Lines
packages/eas-cli/src/build/utils/url.ts	0.00%	3 Missing ⚠️
packages/eas-cli/src/build/runBuildAndSubmit.ts	0.00%	1 Missing ⚠️
packages/eas-cli/src/commands/build/cancel.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3908      +/-   ##
==========================================
+ Coverage   59.05%   59.05%   +0.01%     
==========================================
  Files         935      935              
  Lines       40959    40957       -2     
  Branches     8630     8628       -2     
==========================================
  Hits        24185    24185              
+ Misses      16678    16676       -2     
  Partials       96       96              

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