fix: remove stale constructor interceptors from types and pool options

[trivikr]

This relates to...

Fixes #4993

Rationale

#3399 removed constructor interceptor support at runtime, but the public type declarations still exposed interceptors on Client, Pool, RoundRobinPool, and Agent.

That left a type/runtime mismatch: TypeScript accepted these options even though they were no longer consumed.

Changes

• Remove interceptors from the public Client.Options, Pool.Options, RoundRobinPool.Options, and Agent.Options type declarations.
• Remove the dead options.interceptors copying that was still present in pool constructors.
• Update tsd coverage

Features

N/A

Bug Fixes

• Fix the stale type surface that still advertised constructor-time interceptors after runtime support was dropped.
• Align the public declarations with the current post-chore!: drop interceptors #3399 runtime behavior.

Breaking Changes and Deprecations

A type-level breaking change for consumers still passing these unsupported options.

Status

• I have read and agreed to the Developer's Certificate of Origin
• Tested
• Benchmarked (optional)
• Documented
• Review ready
• In review
• Merge ready

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.87%. Comparing base (51cc6cb) to head (44bccca).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4994   +/-   ##
=======================================
  Coverage   92.86%   92.87%           
=======================================
  Files         110      110           
  Lines       35788    35779    -9     
=======================================
- Hits        33236    33229    -7     
+ Misses       2552     2550    -2     

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