Add "exceptions" key to "gitops" app config

[sgress454]

Related user story

#40171

Task

Add a new exceptions key under gitops, with boolean subkeys software, labels and secrets. So the new config will be:

type GitOpsExceptions struct {
	Labels   bool `json:"labels"`
	Software bool `json:"software"`
	Secrets  bool `json:"secrets"`
}

type UIGitOpsModeConfig struct {
	GitopsModeEnabled bool             `json:"gitops_mode_enabled"`
	RepositoryURL     string           `json:"repository_url"`
	Exceptions        GitOpsExceptions `json:"exceptions"`
}

Condition of satisfaction

• Querying the GET /config API should return current exceptions
• PATCH /config with gitops.enabled should update exceptions and not alter other GitOps config (enabled, url)
• After running migration, existing instances should have labels and secrets exceptions enabled, software disabled
• A new instance should have secrets enabled, software and labels disabled

[chrstphr84]

Testing so far (4.84):

UI

• enabled gitops mode in UI
• Altered settings for exceptions, URL. Saved.
• disabled gitops mode in UI
• observed settings were not altered when gitops mode was disabled.
• Repeated with a variety of settings combinations.

API

• Enabled gitops mode. PATCH {{host}}/api/{{api_version}}/fleet/config
• Altered settings for exceptions, URL.
• Disabled gitops mode.
• Verified settings for exceptions remain in place when gitops is disabled. GET {{host}}/api/{{api_version}}/fleet/config
• Verified settings for exceptions in UI.
• Repeated with a variety of settings combinations.

Next:
Verify migrations.

[juan-fdz-hawa]

Migrations LGTM: