complement for RL e2e test

[shawnh2]

What type of PR is this?

remove the two TODO lines in RL e2e test.

What this PR does / why we need it:

• as for first TODO, wait for deployment/envoy-gateway to finish restart, so the deployment/envoy-ratelimit can be created, and the Sleep can be removed
• as for second TODO, make the resp and req more explicit

[codecov]

Codecov Report

Merging #1469 (ec29db7) into main (22bd06b) will increase coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1469      +/-   ##
==========================================
+ Coverage   61.40%   61.48%   +0.07%     
==========================================
  Files          79       79              
  Lines       11459    11459              
==========================================
+ Hits         7036     7045       +9     
+ Misses       3962     3956       -6     
+ Partials      461      458       -3     

see 2 files with indirect coverage changes

[shawnh2]

it's wired that the request to gateway may connect: connection refused few times and then got 200

[zirain]

/retest