chore: remove unused telemetry

[Freyskeyd]

Description

Remove unused telemetry spans and setup after the refactor and the switch to prometheus to track delivery

PR Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added or updated tests that comprehensively prove my change is effective or that my feature works

[codecov]

Codecov Report

Merging #264 (d2657a4) into main (83293b1) will decrease coverage by 0.47%.
The diff coverage is 66.07%.

@@            Coverage Diff             @@
##             main     #264      +/-   ##
==========================================
- Coverage   53.48%   53.01%   -0.47%     
==========================================
  Files         206      205       -1     
  Lines       10087     9934     -153     
==========================================
- Hits         5395     5267     -128     
+ Misses       4692     4667      -25     

Impacted Files	Coverage Δ
crates/topos-tce-api/src/grpc/mod.rs	57.00% <ø> (-3.00%)	⬇️
crates/topos-tce-api/src/runtime/commands.rs	0.00% <ø> (ø)
crates/topos-tce-api/src/runtime/mod.rs	63.27% <ø> (-1.11%)	⬇️
crates/topos-tce-broadcast/src/lib.rs	88.63% <ø> (-0.13%)	⬇️
crates/topos-tce-broadcast/src/tests/mod.rs	97.89% <ø> (ø)
...s-tce-broadcast/src/tests/task_manager_channels.rs	100.00% <ø> (ø)
...os-tce-broadcast/src/tests/task_manager_futures.rs	100.00% <ø> (ø)
crates/topos-tce-transport/src/lib.rs	66.66% <ø> (ø)
crates/topos-tce/src/app_context/api.rs	58.24% <ø> (-1.34%)	⬇️
crates/topos-tce-broadcast/src/double_echo/mod.rs	72.60% <58.69%> (-0.15%)	⬇️
... and 3 more

... and 1 file with indirect coverage changes

[gruberb]

LGTM 👍