feat(build-and-test-with-yarn): add download of OPA

[TheDome]

No description provided.

[github-actions]

MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ COPYPASTE	jscpd	yes		no	0.92s
✅ CREDENTIALS	secretlint	yes		no	0.93s
✅ GIT	git_diff	yes		no	0.01s
⚠️ SPELL	cspell	1		20	2.07s
⚠️ SPELL	misspell	1		1	0.05s
✅ YAML	prettier	1		0	0.69s
✅ YAML	v8r	1		0	1.83s
⚠️ YAML	yamllint	1		1	0.22s

See errors details in artifact MegaLinter reports on CI Job page
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff