chore(instr-express): use exported strings for attributes

[JamieDanielson]

Which problem is this PR solving?

• updates Update usage of semantic conventions to new exported strings #2025

Short description of the changes

In express instrumentation package:

• Update @opentelemetry/semantic-conventions to ^1.22
• Replace SemanticAttributes.HTTP_ROUTE with exported string SEMATTRS_HTTP_ROUTE
• Update README with new semantic convention package version and key

[codecov]

Codecov Report

Merging #2031 (f21b8b0) into main (dfb2dff) will increase coverage by 0.00%.
Report is 14 commits behind head on main.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2031   +/-   ##
=======================================
  Coverage   90.97%   90.98%           
=======================================
  Files         146      145    -1     
  Lines        7492     7454   -38     
  Branches     1502     1488   -14     
=======================================
- Hits         6816     6782   -34     
+ Misses        676      672    -4     

Files	Coverage Δ
...try-instrumentation-express/src/instrumentation.ts	100.00% <100.00%> (ø)

... and 5 files with indirect coverage changes

[pichlermarc]

Thanks for taking care of this 🙂
Were the tests left out intentionally? 🤔

[JamieDanielson]

Were the tests left out intentionally? 🤔

🤦‍♀️ Oops! No they were not!

[pichlermarc]

Looks good, thanks 🙂