e2e without availability

[ziiiki]

• remove device availability from the code
• delete e2e related to device availability
• delete qiboconnection api methods block_device() and release_device()

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.56%. Comparing base (2549758) to head (343a28b).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #157      +/-   ##
==========================================
+ Coverage   90.15%   91.56%   +1.41%     
==========================================
  Files          53       51       -2     
  Lines        1452     1352     -100     
==========================================
- Hits         1309     1238      -71     
+ Misses        143      114      -29     

Flag	Coverage Δ
unittests	91.56% <100.00%> (+1.41%)	⬆️

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[DZPM]

LGTM!