chore: separate build from test

[dougch]

Release Summary:

Resolved issues:

none

Description of changes:

Codebuild emits timing metrics to CloudWatch per phase. To capture just the build timing, I need a singleton job (not batch) where build and test can be separated. The recent kTLS job is a good candidate.

Call-outs:

There is only one phase after build, so the ASAN build/test is running with the regular tests.

Testing:

locally- this buildspec change should run in CI as well.

Remember:

• Any change to the library source code should at least include unit tests.
• Any change to the core stuffer or blob methods should include CBMC proofs.
• Any change to the CI or tests should:
  1. prove that the test succeeds for good input
  2. prove that the test fails for bad input (eg, a test for memory leaks fails when a memory leak is committed)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[dougch]

close for now