feat(telemetry): support DO_NOT_TRACK and CI env variables to disable telemetry

[peterwht]

Introduces two new ways to disable telemetry.

This can be done by setting either the DO_NOT_TRACK or CI environment variables to 1 or true.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 48.43%. Comparing base (85353ae) to head (f2d4257).
Report is 1 commits behind head on main.

@@            Coverage Diff             @@
##             main     #162      +/-   ##
==========================================
+ Coverage   47.07%   48.43%   +1.35%     
==========================================
  Files          32       32              
  Lines        2649     2707      +58     
  Branches     2649     2707      +58     
==========================================
+ Hits         1247     1311      +64     
+ Misses       1214     1194      -20     
- Partials      188      202      +14     

Files	Coverage Δ
crates/pop-cli/src/main.rs	14.42% <0.00%> (+9.37%)	⬆️
crates/pop-telemetry/src/lib.rs	84.84% <84.61%> (+1.51%)	⬆️

... and 3 files with indirect coverage changes

[evilrobot-01]

Can we do the same with the standardised CI environment variable? I believe it is simply something like CI=true but please kindly check.

[peterwht]

Can we do the same with the standardised CI environment variable? I believe it is simply something like CI=true but please kindly check.

Great idea. CI=true is correct. Will add in

[peterwht]

Unit test CI is likely failing due to CI=true in GitHub which now disables telemetry.