SP-1383: gate early-access commands behind feature flag, replace beta

[A. Jashari (admirjashari)]

Description

Gate early-access (non-GA) commands behind a backend feature flag. If a team runs a gated command that isn't enabled for them, they get a clear "not enabled — contact support" message instead of a generic 403.

Also consolidates the old beta marker into a single earlyAccess:

• earlyAccess(featureKey?) replaces beta()/betaOption() — with a key it's gated at run time, without one it's just an internal marker.
• No (beta) label anymore; early-access status is internal (nothing shown in --help).
• Check uses the existing /api/team/features endpoint with the profile token (flag enabled = key present).
• No profile → normal "no profile" error; check failure → fail-closed "could not verify".
• deployment commands migrated to .earlyAccess() (ungated, behavior unchanged).

Relevant links

• Jira: https://celonis.atlassian.net/browse/SP-1383

Checklist

• I have self-reviewed this PR
• I have tested the change and proved that it works in different scenarios
• Docs — N/A, tracked in a separate ticket

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
90.8% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud