Live pruning is available in archive mode

[blukat29]

Proposed changes

• Enable live pruning in archive mode
  • Currently only worked in full mode. Now it also works in archive mode.
• Address some leftover comments in KIP-111 Prune obsolete trie nodes #1871.
  • Add comments to DeletePruningEnabled() that it is for testing
  • Add missing it.Release() in ReadPruningMarks()
  • Refactor bc.IsLivePruningRequired()
  • When live pruning is disabled, do not start the goroutine in pruneTrieNodeLoop

Types of changes

• Bugfix
• New feature or enhancement
• Others

Checklist

• I have read the CONTRIBUTING GUIDELINES doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes ($ make test)
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

Related issues

Further comments

[blukat29]

@jeongkyun-oh @ethan-kr This PR was supposed to be just minor fixes but incorporated your request to perform pruning in archive mode. PTAL.