Remove the usage of Env.name() using Env.getName()

[shoothzj]

What's the purpose of this PR

Rmove the deprecated method, and delete it. If an internal method has been deprecated for a significant period of time, it may be preferable to remove it. If necessary, we can easily restore it using git.

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.

[codecov]

Codecov Report

Merging #4816 (66e06ef) into master (8344788) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #4816      +/-   ##
============================================
- Coverage     48.26%   48.26%   -0.01%     
+ Complexity     1722     1721       -1     
============================================
  Files           346      346              
  Lines         10778    10777       -1     
  Branches       1075     1075              
============================================
- Hits           5202     5201       -1     
  Misses         5254     5254              
  Partials        322      322              

Impacted Files	Coverage Δ
...k/apollo/portal/component/config/PortalConfig.java	26.66% <0.00%> (ø)
...ework/apollo/portal/controller/ItemController.java	17.77% <0.00%> (ø)
...ctrip/framework/apollo/portal/environment/Env.java	92.64% <ø> (-0.11%)	⬇️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[nobodyiam]

LGTM