chore(instrumentation-net): use strings exported for attributes

[maryliag]

Which problem is this PR solving?

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

Short description of the changes

On package opentelemetry-instrumentation-net:

• Update @opentelemetry/semantic-conventions ^1.23.0
• Use exported strings for Semantic Attributes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.46%. Comparing base (dfb2dff) to head (dcde872).
Report is 109 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2194      +/-   ##
==========================================
- Coverage   90.97%   90.46%   -0.52%     
==========================================
  Files         146      149       +3     
  Lines        7492     7592     +100     
  Branches     1502     1591      +89     
==========================================
+ Hits         6816     6868      +52     
- Misses        676      724      +48     

Files	Coverage Δ
...lemetry-instrumentation-net/src/instrumentation.ts	97.14% <ø> (-0.99%)	⬇️
...ode/opentelemetry-instrumentation-net/src/utils.ts	92.00% <100.00%> (ø)

... and 35 files with indirect coverage changes

[trentm]

Was the intent to add the ## Semantic Conventions section with the attributes table to the README in this PR (and in some of the other PRs in this round) or to do that separately?

[maryliag]

updated the readme (on this PR and the other ones too)

[trentm]

nit:

Suggested change

	"@opentelemetry/semantic-conventions": "^1.23.0"
	"@opentelemetry/semantic-conventions": "^1.22.0"

Thought perhaps I'm wrong and 1.23 is fine.

[maryliag]

Same comment as the other PR, I decided to get the latest version, since it also works