SUBMARINE-1375. Fix custom resource definition requiring database secret

[cdmikechen]

What is this PR for?

The operator-v3 based custom resource already supports automatic secret generation without the database password, so we don't need this config to be required.

What type of PR is it?

Bug Fix

Todos

• [x] - Remove mysqlRootPasswordSecret required

What is the Jira issue?

https://issues.apache.org/jira/browse/SUBMARINE-1375

How should this be tested?

NA

Screenshots (if appropriate)

NA

Questions:

• Do the license files need updating? No
• Are there breaking changes for older versions? No
• Does this need new documentation? No

[codecov[bot]]

Codecov Report

Merging #1059 (25d5da9) into master (5987b92) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1059   +/-   ##
=======================================
  Coverage   75.98%   75.98%           
=======================================
  Files         119      119           
  Lines        5000     5000           
=======================================
  Hits         3799     3799           
  Misses       1201     1201           

Flag	Coverage Δ
python-integration	59.72% <ø> (ø)
python-unit	52.48% <ø> (ø)

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