De-duplicate the filter returned by the getActivateExtension method

[xiaoheng1]

What is the purpose of the change

De-duplicate the filter returned by the getActivateExtension method

see more detail from fix #7587

Brief changelog

Verifying this change

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 60.86%. Comparing base (c8d176f) to head (ff41121).

Files with missing lines	Patch %	Lines
...apache/dubbo/common/extension/ExtensionLoader.java	80.00%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7600      +/-   ##
============================================
+ Coverage     60.47%   60.86%   +0.39%     
- Complexity      456      491      +35     
============================================
  Files          1090     1090              
  Lines         43937    43952      +15     
  Branches       6420     6423       +3     
============================================
+ Hits          26571    26752     +181     
+ Misses        14402    14229     -173     
- Partials       2964     2971       +7     

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[AlbumenJ]

Shall we notify users that there contains two extension have the same name by loggeer?

[xiaoheng1]

Shall we notify users that there contains two extension have the same name by loggeer?

If just print the log, the user also needs to remove it manually, and may also ignore this log.
If the system supports filtering, it will be easier for users to use.

[AlbumenJ]

Shall we notify users that there contains two extension have the same name by loggeer?

If just print the log, the user also needs to remove it manually, and may also ignore this log.
If the system supports filtering, it will be easier for users to use.

Filter those duplicated and log out to notify that has been filtered.

[xiaoheng1]

Filter those duplicated and log out to notify that has been filtered.

Sorry, I misunderstand. Now let’s add a log.