Revert "R - move findFileName from FuncForPC to CallerFrames"

[aleclerc-cio]

Reverts #41

Summary by Sourcery

Chores:

• Revert changes from a previous commit that moved the findFileName function from FuncForPC to CallerFrames.

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Reviewer's Guide by Sourcery

This PR reverts changes made to the file name finding mechanism in the approval testing framework. The implementation switches back from using CallersFrames to using FuncForPC for stack trace analysis, reverting to a more direct approach for finding the test method's file name.

Class diagram for reverted findFileName function

classDiagram
    class ApprovalName {
        +NewApprovalName(name string, fileName string) ApprovalName
    }
    class findFileName {
        +findFileName() *string, error
    }
    class runtime {
        +Callers(skip int, pc []uintptr) int
        +FuncForPC(pc uintptr) *Func
    }
    class Func {
        +Name() string
        +FileLine(pc uintptr) (string, int)
    }
    ApprovalName --> findFileName
    findFileName --> runtime
    runtime --> Func

    note for findFileName "Reverted to using FuncForPC instead of CallersFrames"

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File-Level Changes

Change	Details	Files
Reverted the stack trace analysis implementation from using CallersFrames back to FuncForPC	Removed CallersFrames usage and frame iteration logic Reintroduced direct stack frame indexing with FuncForPC Changed the test runner detection to work with Func instead of Frame objects Modified the file name retrieval to use FileLine method directly from the test method Updated error checking condition for test runner detection	approval_name.go

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