Rails: Add Workspace Suspension with Delayed Termination

MR: Add Workspace Suspension with Delayed Termination (!166065 - merged)

Description

See epic Workspace Suspension with Delayed Termination (gitlab-org#14910 - closed) for full scope and implementation details.

Acceptance Criteria

See detailed Acceptance Criteria section in MR

Technical Requirements

See epic Workspace Suspension with Delayed Termination (gitlab-org#14910 - closed) for full scope and implementation details.

Design Requirements

Removes max_hours_before_termination field from Workspace creation UI.

Impact Assessment

Helps prevent unexpected termination of workspaces and potential loss of ephemeral data in the workspace.