fix: schema validation for job if functions

[ChristopherHX]

Fixes #2444

• Add Tests

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ EDITORCONFIG	editorconfig-checker	2		0	0.01s
✅ REPOSITORY	gitleaks	yes		no	2.3s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	8.15s
✅ REPOSITORY	secretlint	yes		no	1.01s
✅ REPOSITORY	trivy-sbom	yes		no	0.46s
✅ REPOSITORY	trufflehog	yes		no	5.32s

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[mergify]

@ChristopherHX this pull request has failed checks 🛠

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.

Project coverage is 76.69%. Comparing base (5a80a04) to head (71fe493).
Report is 108 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/schema/schema.go	94.73%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #2446       +/-   ##
===========================================
+ Coverage   61.56%   76.69%   +15.12%     
===========================================
  Files          53       62        +9     
  Lines        9002     8177      -825     
===========================================
+ Hits         5542     6271      +729     
+ Misses       3020     1343     -1677     
- Partials      440      563      +123     

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