feat: Add setup[] array to json output- @W-23750625@

[soridalac]

What does this PR do?

Summary

• Add @testsetup method results to the JSON report output as a setup[] array
• Previously, @testsetup results were computed internally but dropped by the JsonReporter, making them invisible in sf apex get test -r json output
• This caused a mismatch where summary.testsRan counted all tests (including setup) but tests[] only contained regular test methods
• Added CliTestSetupResult type and setup?: CliTestSetupResult[] to RunResult
• JsonReporter.format() now maps result.setup into the output when present

Test plan

• Added unit test: "should include @testsetup methods in setup array"
• Existing reporter tests still pass
• Verified with linked plugin against real scratch org (test run 707KE00000RI1M1YAL)

What issues does this PR fix or reference?

@W-23750625@

[WillieRuemmele]

QA Notes

---

✅ :

../../oss/plugin-apex/bin/run.js apex get test -i 707KE00000RI1M1YAL -r json -o test-5sfw5fmzly8h@example.com --json 2>&1 | jq '.result.setup | length' 
824
➜  dreamhouse-lwc git:(main) ✗  hub:(DevHub) scratch:(test-kxgl9zcodaif@example.com) ➜  sf apex get test -i 707KE00000RI1M1YAL -r json -o test-5sfw5fmzly8h@example.com --json 2>&1 | jq '.result.setup | length'
jq: parse error: Invalid numeric literal at line 1, column 5