Cleanup - ProgramRuntimeEnvironments

[Lichtso]

Problem

ProgramRuntimeEnvironments::program_runtime_v2 is unused in the entire code base.

Summary of Changes

Renames:

• get_mock_env() => get_mock_program_runtime_environment()
• create_program_runtime_environment_v1() => create_program_runtime_environment()
• morph_into_deployment_environment_v1() => morph_into_deployment_environment()
• program_runtime_environments_for_execution() => program_runtime_environment_for_execution()
• program_runtime_environments_for_deployment() => program_runtime_environment_for_deployment()
• get_program_runtime_environments_for_execution() => get_program_runtime_environment_for_execution()
• get_program_runtime_environments_for_deployment() => get_program_runtime_environment_for_deployment()
• get_environments_for_epoch() => program_runtime_environment_for_epoch()
• set_environments() => set_program_runtime_environment()
• EpochBoundaryPreparation::upcoming_environments => EpochBoundaryPreparation::upcoming_environment
• TransactionBatchProcessor::environments => TransactionBatchProcessor::program_runtime_environment

Refactors:

• ProgramRuntimeEnvironments::program_runtime_v1 => ProgramRuntimeEnvironment
• program_runtime_environment: Arc::new(BuiltinProgram::new_loader(VmConfig::default()))

Removes:

• ProgramRuntimeEnvironments
• get_mock_program_runtime_environments()

[mergify]

The Firedancer team maintains a line-for-line reimplementation of the
native programs, and until native programs are moved to BPF, those
implementations must exactly match their Agave counterparts.
If this PR represents a change to a native program implementation (not
tests), please include a reviewer from the Firedancer team. And please
keep refactors to a minimum.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.96907% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.1%. Comparing base (9361652) to head (158215f).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #11080     +/-   ##
=========================================
- Coverage    83.1%    83.1%   -0.1%     
=========================================
  Files         837      837             
  Lines      316652   316592     -60     
=========================================
- Hits       263178   263096     -82     
- Misses      53474    53496     +22     

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