Remove heapster package (#2574).

[brianhuffman]

No description provided.

[RyanGlScott]

Make sure to also remove the following:

• The hobbits source repository package, which we no longer need to use:

  saw-script/cabal.project

  Lines 45 to 48 in 68d6efc

  	source-repository-package
  	type: git
  	location: https://github.com/eddywestbrook/hobbits.git
  	tag: 70963e0e3eba2b16f6fc030acb582e8100955e47

• This part of the CI configuration:

  saw-script/.github/workflows/ci.yml

  Line 1095 in 68d6efc

  - heapster-tests

  (I think this bit is what is causing the CI not to run on your pull request.)

[sauclovian-g]

This also definitely needs a changelog entry...

...which should also specifically call out that the signature of write_coq_cryptol_primitives_for_sawcore has changed.

[sauclovian-g]

It looks like heapster/examples/bc-annot/foo.saw came back by accident.

Also, test_type_errors/err053 uses the HeapsterEnv type as a deprecated type to test on, so it will blow up when that's removed. There isn't any other deprecated type at present so we might need to either create a dummy one (which is kind of annoying) or disable the test (which is also kind of annoying).

[brianhuffman]

It looks like heapster/examples/bc-annot/foo.saw came back by accident.

Oops, it looks like I made a mistake with my rebase. I'll give it another try.

[sauclovian-g]

Oops, it looks like I made a mistake with my rebase. I'll give it another try.

Stuff happens :-)

[sauclovian-g]

One last kibitz, then I think you can merge it :-)

[sauclovian-g]

Might also mention the RefnSet type here since it's not immediately obvious to passersby that it's linked to this stuff. (HeapsterEnv pretty obviously is, so mentioning it probably doesn't matter one way or the other.)