Add disclaimer explaining project is EOL

[tgeoghegan]

Also disables dependabot since we no longer want to wrangle those PRs.

[branlwyd]

(it looks like this PR doesn't disable Dependabot, but that's good -- we don't want to do that until the international environment turndown in late June.)

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -3.15 ⚠️

Comparison is base (cfba992) 52.66% compared to head (81c71c1) 49.52%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2772      +/-   ##
==========================================
- Coverage   52.66%   49.52%   -3.15%     
==========================================
  Files          37       14      -23     
  Lines       11690     2441    -9249     
==========================================
- Hits         6157     1209    -4948     
+ Misses       5418     1117    -4301     
  Partials      115      115              

Flag	Coverage Δ
facilitator_tests	?
key_rotator_tests	56.02% <ø> (ø)
workflow_manager_tests	39.28% <ø> (ø)

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see 23 files with indirect coverage changes

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[tgeoghegan]

(it looks like this PR doesn't disable Dependabot, but that's good -- we don't want to do that until the international environment turndown in late June.)

It doesn't do that because I forgot to git rm! I was planning to not merge this until late June. I made the PR at this early date because I think we should loop in comms on this public communication.

[tgeoghegan]

We'll merge this and also archive the repository in a few more weeks, once we stop supporting prod-intl.