chore(feature): add minor unit tests to Scorecard Dependabot

[alizard0]

• DependabotClient tests: add coverage for missing apiBaseUrl and assert a clear Missing GitHub API base URL for '' error; ensure no Octokit paginate call happens in that case.
• DependabotMetricProvider.getRepository tests: add cases for malformed github.com/project-slug values with empty owner (/repo) or empty repo (owner/).
• DependabotMetricProvider.getMetric tests: extend severity-parameterized assertions to verify metric descriptors include history: true (and type: 'number') for each severity.
• DependabotMetricProvider.calculateMetric tests: add rejection/error-propagation coverage when mocked DependabotClient.getAlerts() fails.
• DependabotMetricProvider.getCatalogFilter tests: tighten to strict equality vs @backstage/catalog-client CATALOG_FILTER_EXISTS for github.com/project-slug and 'true' for github.com/dependabot.

https://redhat.atlassian.net/browse/RHIDP-13335
https://redhat.atlassian.net/browse/RHIDP-13323
https://redhat.atlassian.net/browse/RHIDP-13325
https://redhat.atlassian.net/browse/RHIDP-13320

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.75%. Comparing base (5e4d2b2) to head (7e2aa6e).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3045      +/-   ##
==========================================
- Coverage   60.78%   60.75%   -0.04%     
==========================================
  Files        2067     2067              
  Lines       63873    63778      -95     
  Branches    16580    16635      +55     
==========================================
- Hits        38827    38747      -80     
+ Misses      24793    24460     -333     
- Partials      253      571     +318     

Flag	Coverage Δ		*Carryforward flag
adoption-insights	83.58% <ø> (ø)		Carriedforward from f1675af
ai-integrations	70.03% <ø> (ø)		Carriedforward from f1675af
app-defaults	69.60% <ø> (ø)		Carriedforward from f1675af
augment	69.36% <ø> (ø)		Carriedforward from f1675af
bulk-import	72.44% <ø> (ø)		Carriedforward from f1675af
cost-management	16.49% <ø> (ø)		Carriedforward from f1675af
dcm	32.85% <ø> (ø)		Carriedforward from f1675af
extensions	61.42% <ø> (ø)		Carriedforward from f1675af
global-floating-action-button	73.75% <ø> (ø)		Carriedforward from f1675af
global-header	61.62% <ø> (ø)		Carriedforward from f1675af
homepage	50.84% <ø> (-0.08%)	⬇️	Carriedforward from f1675af
konflux	91.01% <ø> (ø)		Carriedforward from f1675af
lightspeed	69.68% <ø> (-0.28%)	⬇️	Carriedforward from f1675af
mcp-integrations	81.59% <ø> (ø)		Carriedforward from f1675af
orchestrator	33.15% <ø> (ø)		Carriedforward from f1675af
quickstart	62.64% <ø> (ø)		Carriedforward from f1675af
sandbox	79.56% <ø> (+0.07%)	⬆️	Carriedforward from f1675af
scorecard	83.64% <ø> (+0.03%)	⬆️
theme	64.54% <ø> (ø)		Carriedforward from f1675af
translations	8.49% <ø> (ø)		Carriedforward from f1675af
x2a	82.09% <ø> (ø)		Carriedforward from f1675af

*This pull request uses carry forward flags. Click here to find out more.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud