feat(restify): Skip update HTTP's span name and update RpcMetadata's route instead

[chigia001]

Which problem is this PR solving?

Each framework has a different approach to updating Span's name and HTTP_ROUTE attribute. We want to delegate this to instrumentation-http for consistent's name and attribute
This PR fixes the above issue for restify@8.6.1

• This will partially fix issue Setting HTTP_ROUTE inconsistent accross HTTP server frameworks #1381

Short description of the changes

• Skip modifying HTTP's Span name directly in instrumentation-restify code
• Update route property of RpcMetadata

Next step

• The version of Restify we current support is very old and not support node@18, there is another PR to upgrade this chore(restify): update restify version to 11.1.0 and re-enable unit test in node@18 #1576

[codecov]

Codecov Report

Merging #1571 (0e486df) into main (10bdbf7) will decrease coverage by 4.27%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1571      +/-   ##
==========================================
- Coverage   96.06%   91.79%   -4.27%     
==========================================
  Files          14      139     +125     
  Lines         914     7117    +6203     
  Branches      199     1431    +1232     
==========================================
+ Hits          878     6533    +5655     
- Misses         36      584     +548     

Files Changed	Coverage Δ
...try-instrumentation-restify/src/instrumentation.ts	90.35% <100.00%> (ø)

... and 124 files with indirect coverage changes