ci: more printing about state of master

[wes-turner]

Two problems combined into one:

1. the session that _wait_for_master used had the system's default retry policy (which takes about 15 seconds before it gives up)
2. _wait_for_master reported every 60 iterations through its loop (which itself was limited by the number of iterations) rather than every 60 seconds. This meant that it only actually reported once every 16 minutes.

CircleCI had been killing workflows that didn't print text after 10 minutes. So when migrations took more than 10 minutes, the whole test would fail.

This PR fixes both of problems (1) and (2).

Description

Test Plan

Commentary (optional)

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

Ticket

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.79%. Comparing base (1e6f0f7) to head (5625aaf).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9058      +/-   ##
==========================================
- Coverage   49.49%   47.79%   -1.70%     
==========================================
  Files         752     1166     +414     
  Lines      103789   143619   +39830     
  Branches     2386     2384       -2     
==========================================
+ Hits        51374    68648   +17274     
- Misses      52256    74812   +22556     
  Partials      159      159              

Flag	Coverage Δ
backend	42.82% <ø> (+8.57%)	⬆️
harness	64.35% <ø> (+<0.01%)	⬆️
web	40.75% <ø> (ø)

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see 415 files with indirect coverage changes

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