optimize: remove enableDegrade properties

[slievrly]

• I have registered the PR changes.

Ⅰ. Describe what this PR did

remove enableDegrade properties

Ⅱ. Does this pull request fix one issue?

fixes #6347

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5667d63) 52.38% compared to head (7f3f12d) 52.42%.
Report is 1 commits behind head on 2.x.

❗ Current head 7f3f12d differs from pull request most recent head 5c577b8. Consider uploading reports for the commit 5c577b8 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #6350      +/-   ##
============================================
+ Coverage     52.38%   52.42%   +0.03%     
- Complexity     5219     5221       +2     
============================================
  Files           920      920              
  Lines         31928    31924       -4     
  Branches       3807     3807              
============================================
+ Hits          16727    16735       +8     
+ Misses        13553    13544       -9     
+ Partials       1648     1645       -3     

Files	Coverage Δ
...ava/org/apache/seata/common/ConfigurationKeys.java	0.00% <ø> (ø)
...configure/properties/client/ServiceProperties.java	57.89% <ø> (+1.37%)	⬆️

... and 4 files with indirect coverage changes

[xingfudeshi]

LGTM