[eas-cli] Fix usage warning bug in eas:build

[mackenco]

Why

Received a bug report that the eas:build command was failing on latest. We were checking the project config too early.

How

Moved the maybeWarnAboutUsageOveragesAsync call later into the command; now it's called in prepareAndStartBuildAsync, after we know we have a config. I put it early in this function because 1) I wanted to warn before we start the build 2) I wanted it to come before most of the other info logged by the command but 3) after createBuildContextAsync is run, since this grabs the accountId.

Test Plan

I overrode the logic in maybeWarnAboutUsageOveragesAsync to always warn locally. I think it's a little odd that it comes after the incremented log, but felt like a logical place in the code for this to live.
Multiple builds:

Single build:

[mackenco]

This this function could run multiple times (per build profile), we want to track if we've warned and only do it once.

[github-actions]

Subscribed to pull request

File Patterns	Mentions
**/*	@douglowder
packages/eas-cli/src/commands/build/**	@sjchmiela
packages/eas-cli/src/build/**	@sjchmiela

Generated by CodeMention

[github-actions]

Size Change: +37 B (0%)

Total Size: 54.9 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	54.9 MB	+37 B (0%)

_{compressed-size-action}

[github-actions]

✅ Thank you for adding the changelog entry!

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.88%. Comparing base (dead119) to head (d5ecd53).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/eas-cli/src/build/runBuildAndSubmit.ts	25.00%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3260      +/-   ##
==========================================
- Coverage   51.89%   51.88%   -0.00%     
==========================================
  Files         631      631              
  Lines       25860    25862       +2     
  Branches     5435     5437       +2     
==========================================
- Hits        13418    13417       -1     
- Misses      11323    11325       +2     
- Partials     1119     1120       +1     

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