Fix init when there is one project in projects config.

[scotthovestadt]

Summary

There may be cases where users have a single project in the projects config (because of conditional projects). Currently, this doesn't go through the same code path as multiple projects and I've noticed it causing Jest fail to initialize.

Test plan

Added test from issue #7496 (PR #7498).

All existing tests pass.

I manually tested that Jest initializes correctly with single project.

[scotthovestadt]

I think there is actually a deeper issue here that will require more than this quick fix, since the types seem convinced it's a string when my understanding (from it's use at FB) is that it can be a string or a config.

However, this solves the immediate issue.

[SimenB]

yup, from #5176

[SimenB]

Nice! Issue for it: #7496

[codecov-io]

Codecov Report

Merging #8409 into master will increase coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #8409      +/-   ##
==========================================
+ Coverage   62.33%   62.35%   +0.01%     
==========================================
  Files         266      266              
  Lines       10730    10742      +12     
  Branches     2613     2617       +4     
==========================================
+ Hits         6689     6698       +9     
- Misses       3459     3461       +2     
- Partials      582      583       +1

Impacted Files	Coverage Δ
packages/jest-config/src/index.ts	11.94% <0%> (-0.56%)	⬇️
packages/jest-snapshot/src/utils.ts	93.33% <0%> (+0.9%)	⬆️

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[SimenB]

Possible to add an e2e test? What about the one from #7498?

Missing changelog entry

[scotthovestadt]

test added and passes! :)

[scotthovestadt]

Applied to existing PR: #7498

[github-actions]

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