feat: Add org level secret scanning custom patterns support

[tanayarun]

Adds support for managing secret scanning custom patterns at the
organization level: list, create, update, and delete.

Related to #4381. This is the second of three planned PRs to fully
resolve the issue.

• Added ListCustomPatternsForOrg, CreateCustomPatternsForOrg,
  UpdateCustomPatternForOrg, DeleteCustomPatternsForOrg to
  SecretScanningService, reusing the request/response types and
  SecretScanningCustomPatternListOptions from feat: Add repo-level secret scanning custom patterns support #4397
• Ran go generate ./... to update iterators
• Added table driven tests for all four methods

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.54%. Comparing base (4d45b7c) to head (7ae3241).

Additional details and impacted files

@@ Coverage Diff @@## master #4426 +/- ##
=======================================
Coverage 97.54% 97.54% =======================================
Files 194 194 Lines 19780 19836 +56 =======================================
+ Hits 19294 19350 +56 
Misses 268 268 Partials 218 218 

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[tanayarun]

Hey, @gmlewis sorry for the delay.
Can you review the pr and lemme know the required changes.

[gmlewis]

Thank you, @tanayarun!
LGTM.
Awaiting second LGTM+Approval from any other contributor to this repo before merging.

cc: @stevehipwell - @alexandear - @Not-Dhananjay-Mishra

[Not-Dhananjay-Mishra]

LGTM

[gmlewis]

Thank you, @Not-Dhananjay-Mishra!
Merging.

[sswane]

Excited about this & the other new features!

@gmlewis I couldn't find the information in the repo and I wasn't sure where to ask this so hope here is ok... when will the new features be released? do you have a release cadence? I tried to look thru the last few releases but wasn't sure what made some months have 0 or 3 releases.

[gmlewis]

Excited about this & the other new features!

@gmlewis I couldn't find the information in the repo and I wasn't sure where to ask this so hope here is ok... when will the new features be released? do you have a release cadence? I tried to look thru the last few releases but wasn't sure what made some months have 0 or 3 releases.

Hi @sswane - we don't have an official policy for release cadence. We try, in general, to make one release per month, but if someone has an urgent need, then we will try to accomodate the requests.

I'll go ahead and start a new release since it has been about a month.

[gmlewis]

@sswane - this is now available here:
https://github.com/google/go-github/releases/tag/v90.0.0

[sswane]

@gmlewis awesome!! thanks a lot, going to try to use it today!