feat: thread new blockheight expiry strategy through sendAndConfirmTransaction

[steveluscher]

Problem

sendTransaction right now only fetches a recent blockhash using the deprecated getRecentBlockhash() method. Notably this is missing the lastValidBlockHeight property that's needed to use the blockheight-based transaction confirmation strategy.

Summary of Changes

Teach the ‘recent blockhash’ cache to fetch using getLatestBlockhash and thread the lastValidBlockHeight down to confirmTransaction through its membership on Transaction.

Fixes #23949.

[codecov]

Codecov Report

Merging #25227 (4de419f) into master (69a0ff9) will decrease coverage by 7.0%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master   #25227       +/-   ##
===========================================
- Coverage    82.0%    75.0%     -7.1%     
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  Files         598       38      -560     
  Lines      165882     2302   -163580     
  Branches        0      335      +335     
===========================================
- Hits       136125     1727   -134398     
+ Misses      29757      459    -29298     
- Partials        0      116      +116