cli: skip no-op program buffer writes

[jstarry]

Problem

When retrying a program deploy, a buffer account might have already been partially written to but the cli program deployer will try to write the entire buffer again, wasting time and transactions.

Summary of Changes

• Before pushing a buffer write transaction, first check if the buffer data is already written with the desired data

Fixes #

[mergify]

Backports to the beta branch are to be avoided unless absolutely necessary for fixing bugs, security issues, and perf regressions. Changes intended for backport should be structured such that a minimum effective diff can be committed separately from any refactoring, plumbing, cleanup, etc that are not strictly necessary to achieve the goal. Any of the latter should go only into master and ride the normal stabilization schedule. Exceptions include CI/metrics changes, CLI improvements and documentation updates on a case by case basis.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 22.22222% with 28 lines in your changes are missing coverage. Please review.

Project coverage is 81.8%. Comparing base (e682fec) to head (db27328).
Report is 30 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master     #277     +/-   ##
=========================================
- Coverage    81.9%    81.8%   -0.1%     
=========================================
  Files         837      837             
  Lines      226539   226557     +18     
=========================================
- Hits       185548   185534     -14     
- Misses      40991    41023     +32