Inject agentw in workspace

MR:

• Add Workspaces Proxy proto options (gitlab-org/cluster-integration/gitlab-agent!2953 - merged)
• Add DB migration to add workspaces proxy option... (!204471 - merged)
• Inject agentw in workspace (!204476 - merged)
• Update workspace network policy (!205021 - merged)
• Update workspace network policy (!205021 - merged)
• Change workspaces agent config dns_zone default... (!205164 - merged)
• Update workspace agent config dns zone validations (!205043 - merged)

Description

• Add http_enabled and ssh_enabled options under remote_development.gitlab_workspaces_proxy in the agentk configuration.
• Update Workspaces tools image which has agentw present
• Inject agentw token as environment variable
• Start agentw as the first thing when a workspace starts if remote_development.gitlab_workspaces_proxy.http_enabled == false
• Do not set ingress attributes in workspaces network policy if remote_development.gitlab_workspaces_proxy.http_enabled == false && remote_development.gitlab_workspaces_proxy.ssh_enabled == false
• Do not require dns_zone if remote_development.gitlab_workspaces_proxy.http_enabled == false

Acceptance criteria

See above

Implementation plan

See above