Move Release Evidence category from the Release stage to the Govern stage

This MR proposes that we move the Release Evidence category from the Release stage to the Govern stage. This idea was discussed as part Release Stage Category Review FY23Q4 (Product#5187 - closed).

Rationale

• Audience for release evidence is compliance and auditing officers rather than the usual Release Stage target personas of development or ops roles.
• Release Evidence is an input for compliance reports and other types of artifacts that aim to document the software development lifecycle.
• Govern is working on SBOM, which relies on Release Evidence, and other related topics so it makes sense for Govern to consider bringing in the category.

Tasks

• Update stages.yml
• Update categories.yml
• Move direction page
• Update the JTBD group to Govern.

Approvals

Merge requests with changes to stages and groups and significant changes to categories need to be created, approved, and/or merged by each of the below:

• Chief Product Officer @david
• The Product Director relevant to the affected Section(s)
• The Engineering Director relevant to the affected Section(s)
  • @sgoldstein (ops release/deploy)
  • @wayne @pcalder (manage:govern)
• Director of Product Design @vkarnes

The following people need to be on the merge request so they stay informed:

• Vice President of Development @clefelhocz1
• Vice President of Quality @meks
• Vice President of User Experience @clenneville
• The Product Marketing Manager relevant to the stage group(s)
• Director of Technical Writing @susantacker

After Approvals and Merge

• Create an issue in the triage-ops project to update GitLab Bot automation:
  • for Category change
  • for Stage or Group change
• Mention the product group Technical Writer to update the documentation metadata
• Share MR in #product, #development, and relevant #s_, #g_, and #f_ slack channels