Add html and text-summary coverage reporters to karma config

[samanthataylor3]

Describe your changes:

Extends coverageIstanbulReporter.reports in karma.conf.cjs from ['lcovonly'] to ['lcovonly', 'html', 'text-summary'] so npm run test also produces a browsable HTML report in coverage/unit/ and prints a coverage summary to the console, in addition to the lcov file consumed by codecov.io.

Verified locally: full unit suite passes (975 SUCCESS, 67 skipped) and reports overall line coverage of 47.75%.

Note: known reporting limitations (Vue instrumentation gaps, skipFilesWithNoCoverage: true excluding fully-uncovered files) are documented in TESTING.md and apply to these reports as well.

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Author Checklist

• Changes address original issue?
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Reviewer Checklist

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Link to Devin session: https://app.devin.ai/sessions/4f85fd0beb834627b810941e79e6423d
Requested by: @samanthataylor3

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[devin-ai-integration]

Original prompt from Samantha

Repository: COG-GTM/openmct (ref: master)

Goal: Produce a human-readable unit test line-coverage report for the codebase (or a user-specified subdirectory of src).

Context:

• Unit tests run via Karma + Jasmine using the config file karma.conf.cjs. Run them with npm run test (headless Chrome). Install deps first with nvm use (if available) and npm install.
• Coverage is instrumented via babel-plugin-istanbul and the coverage-istanbul Karma reporter, configured in karma.conf.cjs under coverageIstanbulReporter. Currently it only outputs lcovonly into coverage/unit.

Steps:

1. In karma.conf.cjs, extend coverageIstanbulReporter.reports to include 'html' and 'text-summary' in addition to 'lcovonly' so a human-readable report is produced (HTML in coverage/unit and a summary printed to the console).
2. Run npm run test to execute the full unit suite and generate coverage.
3. Collect the text-summary output and the generated HTML report from coverage/unit.
4. Summarize overall and per-directory line coverage. Explicitly flag any Vue (.vue) files or others that appear uncovered due to known Istanbul/Vue instrumentation gaps (documented in TESTING.md), so the numbers aren't misread as missing tests.
5. Report the results back, including the path to the HTML report.

Expected outcome: A clear coverage summary plus an HTML report, with caveats noted about known instrumentation/accuracy limitations.

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