fix(crons): Properly checks for environment name lengths

[rjo100]

Safety check for environment name lengths

Related relay PR getsentry/relay#2309
Closes SENTRY-1351

[codecov]

Codecov Report

Merging #52820 (c650350) into master (b3f6334) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #52820   +/-   ##
=======================================
  Coverage   79.46%   79.46%           
=======================================
  Files        4936     4936           
  Lines      207392   207415   +23     
  Branches    35422    35426    +4     
=======================================
+ Hits       164796   164815   +19     
- Misses      37560    37563    +3     
- Partials     5036     5037    +1     

Impacted Files	Coverage Δ
...c/app/views/organizationStats/usageChart/utils.tsx	52.08% <ø> (ø)
src/sentry/monitors/consumers/monitor_consumer.py	89.47% <100.00%> (+0.25%)	⬆️
...monitors/endpoints/monitor_ingest_checkin_index.py	94.50% <100.00%> (ø)
src/sentry/monitors/models.py	92.90% <100.00%> (+0.09%)	⬆️

... and 13 files with indirect coverage changes