Early branch: Minor adjustments of the monthly release template

Follow-up from #21327 (closed)

A new monthly release template was introduced to represent the new monthly release schedule:

https://gitlab.com/gitlab-org/release-tools/-/blob/master/templates/monthly_early_branch_creation.md.erb

On this template, we need to do the following adjustments:

• Add a step on the Initial RC section indicating that release candidate should only be tagged if the patch release has been completed. For context, there is one step on the patch template to lead release managers to continue with the initial RC https://gitlab.com/gitlab-org/release-tools/-/blob/master/templates/patch.md.erb#L115
• Add a brief blurb after the monthly_release_initial_rc:start to indicate that the initial releaes candidate will be automatically tagged and after X time two jobs will be automatically triggered (verify_rc_pipeline and verify_pre_deployment) .
• Remove the RC Tagged metric step https://gitlab.com/gitlab-org/release-tools/-/blob/master/templates/monthly_early_branch_creation.md.erb#L90