Check whether github.com/pkg/errors can be replaced with standard library functions

[alexzurbonsen]

The module github.com/pkg/errors is no longer maintained, see for example pkg/errors#245.

It seems like it can be removed and replaced by standard lib functionality (mainly errors.Errorf --> fmt.Errorf), which includes all of the functionality, except for the stack traces, that are included in the error type from pkg/errors. See for example this comment microsoft/go-winio#227 (comment).

We should probably check whether removal is sensible and if yes replace it.

Progress:

this needs to be fixed in

• ./orc8r : refactor(orc8r): replace deprecated errors module #12724
• ./feg : refactor(feg): replace deprecated errors module #12726
• ./cwf : refactor(cwg): replace deprecated errors module #12725
• ./src : refactor: replace deprecated errors module in src #12729
• ./dp : refactor(dp): replace deprecated errors module #12727
• ...

[MoritzThomasHuebner]

Summary

These PRs remove the uses of github.com/pkg/errors which is no longer maintained. However, this change will remove stack traces in the output.

• Replaces calls of the form errors.Wrap(err, wrap) with fmt.Errorf(wrap + ": %w", err) (or similar).
• Replaces calls of the form errors.Wrapf(err, wrap, ...vars) with fmt.Errorf(wrap + ": %w", ...vars, err).
• Replace use of errors.New(fmt.Sprintf(...)) with fmt.Errorf.
• Replaces calls to github.com/pkg/errors errors.New with errors.New in the standard library.
• Replaces calls to errors.WithStack(err) with err.
• Replaces calls to github.com/pkg/errors errors.Cause with errors.Unwrap in the standard library.
• Replaces a few other calls to github.com/pkg/errors which rarely appear in the project.

I attached an example below of the change in output. I obtained this by modifying the source code so a test would fail.

Old output:

    eap_aka_test.go:48: 
        	Error Trace:	eap_aka_test.go:48
        	Error:      	Received unexpected error:
        	            	I caused this error deliberately.
        	            	Error validating EAP packet
        	            	magma/cwf/gateway/services/uesim/servicers.(*UESimServer).HandleEap
        	            		/home/bmoritz/Documents/magma/cwf/gateway/services/uesim/servicers/eap.go:36
        	            	magma/cwf/gateway/services/uesim/servicers_test.TestEapAkaIdentityRequest
        	            		/home/bmoritz/Documents/magma/cwf/gateway/services/uesim/servicers/eap_aka_test.go:47
        	            	testing.tRunner
        	            		/usr/local/go/src/testing/testing.go:1439
        	            	runtime.goexit
        	            		/usr/local/go/src/runtime/asm_amd64.s:1571

New output

    eap_aka_test.go:48: 
        	Error Trace:	eap_aka_test.go:48
        	Error:      	Received unexpected error:
        	            	Error validating EAP packet: I caused this error deliberately.
        	Test:       	TestEapAkaIdentityRequest