Improve the project health issue template driven by project feedback

[TheFoxAtWork]

https://github.com/cncf/toc/blob/main/.github/ISSUE_TEMPLATE/project-health.yaml

Needs modified to outline the following additional elements:

• Link to the issue filed in the project that corresponds with the TOC tracking issue.
• Include introductory language to the following effect:
  • "This Health of issue has been filed to ascertain the current activity and health of the project so the TOC may identify the appropriate support and guidance for the project to return to an optimal state of health or determination of archival. It is intended to initiate a public discussion to seek understanding and define a path forward. Perceptions or commentary counter to this are not constructive for the project or the community. Should maintainers have sensitive, confidential, or private factors and concerns that influence or affect the project they are encouraged to contact the TOC directly through CNCF Staff, the private-toc mailing list, slack, or email."