Simplified code in flight integration tests

[jorgecarleitao]

This PR cleans up the code used to run Flight integration tests.

Main changes are:

• replaced usage of bounded channels by try_stream (server and client)
• simplified the creation of the stream of FlightData (client)
• added instructions on how to run the tests
• simplified naming

[codecov]

Codecov Report

Merging #1136 (c6f5371) into main (b3583b6) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1136      +/-   ##
==========================================
- Coverage   83.49%   83.48%   -0.01%     
==========================================
  Files         366      366              
  Lines       35635    35635              
==========================================
- Hits        29752    29751       -1     
- Misses       5883     5884       +1     

Impacted Files	Coverage Δ
src/array/utf8/mod.rs	85.62% <0.00%> (-0.96%)	⬇️
src/io/ipc/read/reader.rs	96.53% <0.00%> (ø)
src/bitmap/immutable.rs	84.56% <0.00%> (+0.61%)	⬆️
src/bitmap/utils/slice_iterator.rs	98.78% <0.00%> (+1.21%)	⬆️

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