[BN2] Update BN2 creation, deletion CI workflows

[gomisha]

Context

This PR tweaks and finalizes the changes to BN2 CI workflows for creating and deleting Benchnet 2 networks.

This PR is made in conjunction with https://github.com/dapperlabs/flow-go/pull/6632

• removed old way of testing new network is accessible
  • removed make k8s-expose-locally
  • removed make k8s-test-network-accessibility
  • using new way now (flow blocks get latest --host access1-<network_id>.benchnet.onflow.org:80)

ref: https://github.com/dapperlabs/flow-go/pull/6632

[codecov-commenter]

Codecov Report

Merging #4177 (9ab7f9d) into master (bc11d79) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4177      +/-   ##
==========================================
- Coverage   53.61%   53.59%   -0.02%     
==========================================
  Files         848      848              
  Lines       79054    79054              
==========================================
- Hits        42382    42369      -13     
- Misses      33301    33319      +18     
+ Partials     3371     3366       -5     

Flag	Coverage Δ
unittests	53.59% <ø> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

see 13 files with indirect coverage changes

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[gomisha]

bors merge

[bors]

Build succeeded:

• Integration Tests (make -C integration access-tests)
• Integration Tests (make -C integration bft-tests)
• Integration Tests (make -C integration collection-tests)
• Integration Tests (make -C integration consensus-tests)
• Integration Tests (make -C integration epochs-tests)
• Integration Tests (make -C integration execution-tests)
• Integration Tests (make -C integration ghost-tests)
• Integration Tests (make -C integration mvp-tests)
• Integration Tests (make -C integration network-tests)
• Integration Tests (make -C integration verification-tests)
• Lint (./)
• Lint (./crypto/)
• Lint (./integration/)
• Unit Tests (access)
• Unit Tests (admin)
• Unit Tests (cmd)
• Unit Tests (consensus)
• Unit Tests (engine)
• Unit Tests (fvm)
• Unit Tests (ledger)
• Unit Tests (module)
• Unit Tests (network)
• Unit Tests (others)
• Unit Tests (utils)