Make LightGBM not verbose

[MichaelFu512]

Pull Request Description

Closes #4307

Whenever you run automl.search(), LightGBM really likes to say the same warning over and over again.

For example, in the start page of the documentation for EvalML even if you set verbose=False:

the output has this:

This continues for like 70 more lines.

---

After creating the pull request: in order to pass the release_notes_updated check you will need to update the "Future Release" section of docs/source/release_notes.rst to include this pull request by adding :pr:123.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (46baada) 99.7% compared to head (09b1d19) 99.7%.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #4308   +/-   ##
=====================================
  Coverage   99.7%   99.7%           
=====================================
  Files        357     357           
  Lines      39739   39739           
=====================================
  Hits       39619   39619           
  Misses       120     120           

Files Changed	Coverage Δ
...ents/estimators/classifiers/lightgbm_classifier.py	100.0% <ø> (ø)
evalml/tests/component_tests/test_components.py	99.1% <ø> (ø)

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[MichaelFu512]

Note: this does suppress everything that LightGBM would display. (including info and warnings).

[eccabay]

Thanks for this!