Do not throw an error when the same theme enabled twice

[VicDeo]

Description

I shouldn't get a serious exception when I enable an app a 2nd time. Other apps doesn't have this problem

TL;DR
#31475

Related Issue

Fixes #31475

Motivation and Context

#31475 (comment)

How Has This Been Tested?

enabling the same the twice with no error:

deo@jah-mobile:> php occ app:enable theme-example
theme-example enabled
deo@jah-mobile:> php occ app:enable theme-example
theme-example enabled

enabling a different theme (exception is expected in this case):

> php occ app:enable theme-hey

In AppManager.php line 260:
                                                               
  theme-hey can't be enabled until theme-example is disabled.  
                                                               

app:enable [-g|--groups GROUPS] [--] <app-id>

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #31771 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master   #31771      +/-   ##
============================================
+ Coverage     63.17%   63.17%   +<.01%     
- Complexity    18448    18449       +1     
============================================
  Files          1158     1158              
  Lines         69294    69296       +2     
  Branches       1261     1261              
============================================
+ Hits          43776    43778       +2     
  Misses        25148    25148              
  Partials        370      370

Flag	Coverage Δ	Complexity Δ
#javascript	52.47% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	64.4% <100%> (ø)	18449 <0> (+1)	⬆️

Impacted Files	Coverage Δ	Complexity Δ
lib/private/App/AppManager.php	86.04% <100%> (+0.13%)	84 <0> (+1)	⬆️

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[PVince81]

@VicDeo please backport for after 10.0.9

[VicDeo]

Stable10: #31783

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.