program-test: Add large bootstrap stake for realistic warmups (backport #16739)

[mergify]

This is an automatic backport of pull request #16739 done by Mergify.

Cherry-pick of f421463 has failed:

On branch mergify/bp/v1.6/pr-16739
Your branch is up to date with 'origin/v1.6'.

You are currently cherry-picking commit f4214637a.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   Cargo.lock
	modified:   program-test/src/lib.rs
	modified:   program-test/tests/warp.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   program-test/Cargo.toml

To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

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[codecov]

Codecov Report

Merging #16741 (6bb0d32) into v1.6 (50e441a) will decrease coverage by 0.0%.
The diff coverage is 0.0%.

@@            Coverage Diff            @@
##             v1.6   #16741     +/-   ##
=========================================
- Coverage    82.9%    82.9%   -0.1%     
=========================================
  Files         414      414             
  Lines      114017   114022      +5     
=========================================
- Hits        94555    94540     -15     
- Misses      19462    19482     +20