Fix the notification get request

[chkeita]

Summary of the Pull Request

Read the notification request parmeters from the body of the request instead of the uri
related to #2589

[codecov-commenter]

Codecov Report

Merging #2591 (81ef3cf) into main (e6dd1ac) will increase coverage by 5.76%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2591      +/-   ##
==========================================
+ Coverage   29.66%   35.42%   +5.76%     
==========================================
  Files         282      134     -148     
  Lines       34202    17170   -17032     
==========================================
- Hits        10145     6083    -4062     
+ Misses      24057    11087   -12970     

Impacted Files	Coverage Δ
src/agent/coverage/src/code.rs	8.29% <0.00%> (-11.35%)	⬇️
src/agent/onefuzz/src/sanitizer.rs	69.69% <0.00%> (-2.53%)	⬇️
src/agent/onefuzz/src/machine_id.rs	51.21% <0.00%> (-0.51%)	⬇️
src/agent/onefuzz/src/process.rs	1.45% <0.00%> (-0.03%)	⬇️
src/agent/onefuzz/src/asan.rs	0.00% <0.00%> (ø)
src/agent/coverage/src/cache.rs	0.00% <0.00%> (ø)
src/agent/coverage/src/debuginfo.rs	0.00% <0.00%> (ø)
src/agent/onefuzz-agent/src/setup.rs	0.00% <0.00%> (ø)
src/agent/onefuzz-agent/src/reboot.rs	0.00% <0.00%> (ø)
src/agent/onefuzz/src/input_tester.rs	0.00% <0.00%> (ø)
... and 180 more

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