Remove deprecations

[azeey]

🎉 New feature

Summary

Remove functions that were deprecated in gz-sensors7. Also remove ignition headers.

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[ahcorde]

I added some suggestions here azeey#1

[codecov]

Codecov Report

Merging #365 (0ff70cf) into main (51ac448) will increase coverage by 0.42%.
The diff coverage is 100.00%.

❗ Current head 0ff70cf differs from pull request most recent head 3d89b46. Consider uploading reports for the commit 3d89b46 to get more accurate results

@@            Coverage Diff             @@
##             main     #365      +/-   ##
==========================================
+ Coverage   72.20%   72.63%   +0.42%     
==========================================
  Files          36       36              
  Lines        4980     4948      -32     
==========================================
- Hits         3596     3594       -2     
+ Misses       1384     1354      -30     

Files Changed	Coverage Δ
include/gz/sensors/Manager.hh	83.33% <ø> (ø)
include/gz/sensors/SensorFactory.hh	60.52% <ø> (ø)
src/SensorFactory.cc	100.00% <ø> (+75.00%)	⬆️
src/Manager.cc	100.00% <100.00%> (+34.28%)	⬆️
src/Sensor.cc	91.66% <100.00%> (+1.36%)	⬆️
src/Util.cc	85.00% <100.00%> (+10.00%)	⬆️