Update the policy drawer actions tags sentence

Why are we doing this work

• The policy drawer summary sentence is confusing; reword it

Relevant links

Implementation plan

MR 1

• frontend update the policy-drawer/scan_execution_policy.vue to match the designs
  • there will be a lot of edge-cases (e.g. multiple scanners, multiple agents, site/scanner profiles, etcetera), so be prepared to ask UX for anything missed

Verification steps

1. Upload a GitLab Ultimate license
2. Navigate to a group/project => Security & Compliance => Policies => New policy => Scan Execution Policy => Create a policy => Navigate to the policies list (e.g. gdk group/gdk project
3. Verify changes
4. Navigate to a group/project => Security & Compliance => Policies => New policy => Scan Result Policy => Create a policy => Navigate to the policies list (e.g. gdk group/gdk project
5. Verify no changes have occurred