fix(active-record): avoid error spans for handled RecordInvalid

[aviralgarg05]

Summary

This PR fixes issue #1459 by preventing low-signal error spans for app-handled ActiveRecord bang persistence exceptions.

What changed

• save!, create!, and update! now close spans and re-raise configured handled exceptions outside the span.
• Default handled exception list remains narrow: [ActiveRecord::RecordInvalid].
• Added optional configuration: handled_exceptions, which can include entries like ActiveRecord::RecordNotFound when teams explicitly want that behavior.

Why this is in scope

• Default behavior still targets the original issue for RecordInvalid.
• Reviewer feedback about configurability is implemented without broadening defaults.

Tests

• RecordInvalid is suppressed for save!, create!, and update!.
• Non-handled exceptions still emit exception events.
• Configured handled exception behavior is covered by tests.

[dmathieu]

What about other errors that usually don't raise either, such as RecordNotFound?
Should the list of exceptions be configurable?

[aviralgarg05]

What about other errors that usually don't raise either, such as RecordNotFound? Should the list of exceptions be configurable?

Applied these as well