fix import config bug

[lepdou]

What's the purpose of this PR

Which issue(s) this PR fixes:

1. fix cover existed app when importing app
2. fix import cluster info to all envs when importing cluster

Brief changelog

Follow this checklist to help us incorporate your contribution quickly and easily:

• Read the Contributing Guide before making this pull request.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit tests to verify the code.
• Run mvn clean test to make sure this pull request doesn't break anything.
• Update the CHANGES log.

[codecov-commenter]

Codecov Report

Merging #4262 (e52431f) into master (0ae4fc7) will decrease coverage by 0.00%.
The diff coverage is 64.00%.

@@             Coverage Diff              @@
##             master    #4262      +/-   ##
============================================
- Coverage     52.59%   52.59%   -0.01%     
  Complexity     2632     2632              
============================================
  Files           486      486              
  Lines         15221    15232      +11     
  Branches       1572     1572              
============================================
+ Hits           8006     8011       +5     
- Misses         6660     6666       +6     
  Partials        555      555              

Impacted Files	Coverage Δ
...ip/framework/apollo/portal/service/AppService.java	15.66% <0.00%> (-0.20%)	⬇️
...rk/apollo/portal/service/ConfigsImportService.java	73.41% <66.66%> (-1.48%)	⬇️
.../apollo/internals/RemoteConfigLongPollService.java	77.71% <0.00%> (-0.61%)	⬇️
...ervice/service/ReleaseMessageServiceWithCache.java	87.05% <0.00%> (+1.17%)	⬆️
...o/openapi/filter/ConsumerAuthenticationFilter.java	100.00% <0.00%> (+5.88%)	⬆️

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[nobodyiam]

LGTM