workflows/labels: dynamically adjust reservoir to remaining rate limit

Instead of approximating how many requests we can still make and hoping
the best that concurrent jobs won't break the bank, we can just work
with the actual limits. By updating regularly, we make sure that
concurrent jobs are taken into account. We always keep a reserve of 1000
requests to make sure *any* non-labeling jobs using this app will always
succeed.

This will allow us to easily backfill labels across multiple days,
especially taking the increased rate limit for the app into account.
With this, we should get up to 11.5k requests per hour in.

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