WIP: increase ratelimit-burst-size for global use

[Groxx]

unfortunately much more work than expected, due to how intertwined some of this is.

fully separating out frontend limits would probably simplify things, but there's more work to do to get there.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 87.50000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 73.10%. Comparing base (1771349) to head (05c121e).

Files with missing lines	Patch %	Lines
common/quotas/global/collection/collection.go	66.66%	5 Missing :warning:

Additional details and impacted files

Files with missing lines	Coverage Δ
common/quotas/dynamicratelimiter.go	76.92% <100.00%> (+10.25%)	:arrow_up:
...mmon/quotas/global/collection/internal/fallback.go	96.49% <100.00%> (ø)
common/quotas/permember.go	100.00% <100.00%> (ø)
common/quotas/ratelimiter.go	82.53% <100.00%> (+3.69%)	:arrow_up:
common/quotas/global/collection/collection.go	83.63% <66.66%> (-1.39%)	:arrow_down:

... and 6 files with indirect coverage changes

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[dkrotx]

I think the commit-message isn't aligned with the change. I would expect more like tweaking constants for ratelimit-burst-size. Is it?