ref(slack): customizable context using NotificationConfig

[cathteng]

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (8e78cfe) 55.95% compared to head (0e1fbd5) 81.38%. Report is 3 commits behind head on master.

:exclamation: Current head 0e1fbd5 differs from pull request most recent head 0356e2d. Consider uploading reports for the commit 0356e2d to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #64977       +/-   ##
===========================================
+ Coverage   55.95%   81.38%   +25.42%     
===========================================
  Files        5242     5243        +1     
  Lines      231795   231475      -320     
  Branches    45445    45426       -19     
===========================================
+ Hits       129705   188390    +58685     
+ Misses      97989    37229    -60760     
- Partials     4101     5856     +1755     

Files	Coverage Δ
src/sentry/issues/grouptype.py	99.03% <100.00%> (+9.76%)	:arrow_up:
...entry/integrations/slack/message_builder/issues.py	89.78% <88.88%> (+74.09%)	:arrow_up:

... and 1986 files with indirect coverage changes

[sentry[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ TimeoutError: Timeout connecting to server sentry.tasks.digests.deliver_digest View Issue
• ‼️ SnubaError: result not available before execution deadline sentry.tasks.digests.deliver_digest View Issue

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