Automated cherry pick of #5812: fix: mysql addon username

[erda-bot]

Cherry pick of #5812 on release/2.3.

Squashed commit message:

commit 580a303adeb5f5253342f2b4dffe8aac1166fe96
Author: 悟空 <rainchan365@163.com>
Date:   Thu Apr 13 09:50:17 2023 +0800

    fix: mysql addon username (#5812)
    
    * fix: mysql addon username
    
    * fix: typo
    
    * ut:
    
    * fix: ut failure
    
    * feat: Refining unit tests

---

What this PR does / why we need it:

修复 mysql addon 未创建 username 的问题.

问题原因: 判断 mysql addon 未指定 create_dbs 时就提前返回了. 期望结果是无论是否指定 create_dbs 都应当返回 username.

Which issue(s) this PR fixes:

• Fixes #your-issue_number
• [Erda Cloud Issue Link](paste your link here)

Specified Reviewers:

/assign @your-reviewer

ChangeLog

Language	Changelog
🇺🇸 English	Fix mysql addon not creating username issue.
🇨🇳 中文	修复 mysql addon 未创建 username 的问题.

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Add comment like /cherry-pick release/1.0 when this PR is merged.

For details on the cherry pick process, see the cherry pick requests section under CONTRIBUTING.md.

[codecov]

Codecov Report

Merging #5813 (580a303) into release/2.3 (a4bd710) will increase coverage by 0.00%.
The diff coverage is 48.86%.

Additional details and impacted files

@@             Coverage Diff              @@
##           release/2.3    #5813   +/-   ##
============================================
  Coverage        22.16%   22.17%           
============================================
  Files             1837     1837           
  Lines           203708   203748   +40     
============================================
+ Hits             45158    45182   +24     
- Misses          153362   153368    +6     
- Partials          5188     5198   +10     

Impacted Files	Coverage Δ
.../tools/orchestrator/services/addon/addon_status.go	12.77% <0.00%> (-0.09%)	⬇️
...al/apps/msp/apm/checker/apis/checker.v1.service.go	18.21% <44.82%> (+1.51%)	⬆️
.../tools/orchestrator/services/addon/addon_deploy.go	28.24% <65.21%> (+1.74%)	⬆️

... and 8 files with indirect coverage changes