feat(instrumentation-fastify): Enable Fastify v5

[onurtemizkan]

Resolves: #2438
Related: getsentry/sentry-javascript#13774

Enables instrumentation on Fastify versions 5.x.x

Looking at Fastify's v5 migration guide, the breaking changes of this major release are mainly about removing deprecated methods. Those related to this SDK already seem to be covered.

The current set of tests is passing as is.

The newly introduced support for Diagnostic Channels can be implemented with a follow-up PR if OTEL maintainers decide to do so.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.77%. Comparing base (dfb2dff) to head (233f4e0).
Report is 250 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2460      +/-   ##
==========================================
- Coverage   90.97%   90.77%   -0.21%     
==========================================
  Files         146      156      +10     
  Lines        7492     7716     +224     
  Branches     1502     1584      +82     
==========================================
+ Hits         6816     7004     +188     
- Misses        676      712      +36     

Files with missing lines	Coverage Δ
...try-instrumentation-fastify/src/instrumentation.ts	95.31% <ø> (-0.18%)	⬇️

... and 75 files with indirect coverage changes

[github-actions]

This package does not have an assigned component owner and is considered unmaintained. As such this package is in feature-freeze and this PR will be closed with 14 days unless a new owner or a sponsor (a member of @open-telemetry/javascript-approvers) for the feature is found. It is the responsibility of the author to find a sponsor for this feature.
Are you familiar with this package? Consider becoming a component owner.

[david-luna]

I sponsor this PR :)