Add a warning for unknown default profiles

[marcelogomez]

Summary

This PR addresses #388:

• Introduces NextestConfigImpl::DEFAULT_PROFILES, a const containing all the nextest defined profiles (at the moment this only includes default and default-miri)
• Looks through all profiles in a project's config for profiles with the default- prefix that are not in NextestConfigImpl::DEFAULT_PROFILES and produces a warning for each of them

Note that I ended up doing this in nextest-runner/src/config.rs instead of in cargo-nextest since AFAICT this is where a lot of the early validation of config files is being done and similar warnings were already being emitted there. Happy to move if you still feel the binary (e.g. somewhere in nextest-runner/src/dispatch.rs?) is a better place for this.

Test Plan

• Ran cargo xfmt

• Ran cargo nextest run --all-features. Saw integration-tests failures but they seem unrelated to my changes and they repro on base rev, hopefully CI will tell me if they're legit.

• Set up a dummy library project with some profiles that should and some that shouldn't trigger this warning.

[profile.default-unknown]
fail-fast = false

[profile.default-yet-another-unknown]
fail-fast = false

[profile.not-default-unknown]
fail-fast = true

Then ran the tests with my changes, verified that only the expected profiles trigger the warning

➜  nextest-test git:(main) ✗ nt.local nextest run
warning: found unknown profiles in the reserved default- namespace in .config/nextest.toml:
warning:   default-unknown
warning:   default-yet-another-unknown
    Finished test [unoptimized + debuginfo] target(s) in 0.00s
    Starting 2 tests across 1 binaries
        PASS [   0.006s] nextest-test tests::test_bar
        PASS [   0.006s] nextest-test tests::test_foo
------------
     Summary [   0.009s] 2 tests run: 2 passed, 0 skipped

Renamed all profiles to no longer have the default- prefix, verified that no warnings are triggered

➜  nextest-test git:(main) ✗ nt.local nextest run
    Finished test [unoptimized + debuginfo] target(s) in 0.00s
    Starting 2 tests across 1 binaries
        PASS [   0.006s] nextest-test tests::test_bar
        PASS [   0.006s] nextest-test tests::test_foo
------------
     Summary [   0.009s] 2 tests run: 2 passed, 0 skipped

[codecov]

Codecov Report

Merging #747 (5975d97) into main (922a9bb) will increase coverage by 0.02%.
The diff coverage is 56.25%.

@@            Coverage Diff             @@
##             main     #747      +/-   ##
==========================================
+ Coverage   76.88%   76.90%   +0.02%     
==========================================
  Files          57       57              
  Lines       12623    12640      +17     
==========================================
+ Hits         9705     9721      +16     
- Misses       2918     2919       +1     

Impacted Files	Coverage Δ
nextest-runner/src/config.rs	91.89% <56.25%> (+0.02%)	⬆️

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[sunshowers]

Looks good, thank you!

[FrankReh]

Should #388 be closed?