in shrink, get stores prior to shrink starting

[jeffwashington]

Problem

Fix assert on canaries.
Parallel iter can start a shrink, then we ask for a storage from a slot, expecting shrink to not be allowed to be active.

panicked at 'assertion failed: self.no_shrink_in_progress()', accounts-db/src/account_storage.rs:78:9)

Introduced here:
ShrinkCandidates only holds slot (#33173)

Summary of Changes

Get all stores for shrinks prior to starting shrinking.

Fixes #

[brooksprumo]

lgtm

[codecov]

Codecov Report

Merging #33194 (09f67e9) into master (b588beb) will decrease coverage by 0.1%.
The diff coverage is 62.5%.

@@            Coverage Diff            @@
##           master   #33194     +/-   ##
=========================================
- Coverage    82.1%    82.1%   -0.1%     
=========================================
  Files         786      786             
  Lines      211590   211596      +6     
=========================================
- Hits       173835   173818     -17     
- Misses      37755    37778     +23     

📢 Have feedback on the report? Share it here.

[ilya-bobyr]

I had this assertion triggered on the v1.16 branch.
So this should probably be backported?

---

Update: Sorry, I was actually running a master build %)