Add tfawserr.ErrHTTPStatusCodeEquals, AWS SDK for Go v2 variant of v2/awsv1shim/tfawserr.ErrStatusCodeEquals

[ewbankkit]

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Adds an AWS SDK for Go v2 variant of the ErrStatusCodeEquals helper in v2/awsv1shim/tfawserr.
Renamed to better reflect that it's an HTTP status code we're matching on.
Enhanced with varargs list of status codes.

Relates #524.
Relates #533.

% go test -v -run=TestErrHTTPStatusCodeEquals ./tfawserr
=== RUN   TestErrHTTPStatusCodeEquals
=== RUN   TestErrHTTPStatusCodeEquals/other_error
=== RUN   TestErrHTTPStatusCodeEquals/Wrapped_smithyhttp.ResponseError_matching_first_code
=== RUN   TestErrHTTPStatusCodeEquals/Wrapped_smithyhttp.ResponseError_matching_last_code
=== RUN   TestErrHTTPStatusCodeEquals/Wrapped_smithyhttp.ResponseError_non-matching_codes
=== RUN   TestErrHTTPStatusCodeEquals/nil_error
=== RUN   TestErrHTTPStatusCodeEquals/Top-level_smithyhttp.ResponseError_matching_first_code
=== RUN   TestErrHTTPStatusCodeEquals/Top-level_smithyhttp.ResponseError_matching_last_code
=== RUN   TestErrHTTPStatusCodeEquals/Top-level_smithyhttp.ResponseError_no_code
=== RUN   TestErrHTTPStatusCodeEquals/Top-level_smithyhttp.ResponseError_non-matching_codes
--- PASS: TestErrHTTPStatusCodeEquals (0.00s)
    --- PASS: TestErrHTTPStatusCodeEquals/other_error (0.00s)
    --- PASS: TestErrHTTPStatusCodeEquals/Wrapped_smithyhttp.ResponseError_matching_first_code (0.00s)
    --- PASS: TestErrHTTPStatusCodeEquals/Wrapped_smithyhttp.ResponseError_matching_last_code (0.00s)
    --- PASS: TestErrHTTPStatusCodeEquals/Wrapped_smithyhttp.ResponseError_non-matching_codes (0.00s)
    --- PASS: TestErrHTTPStatusCodeEquals/nil_error (0.00s)
    --- PASS: TestErrHTTPStatusCodeEquals/Top-level_smithyhttp.ResponseError_matching_first_code (0.00s)
    --- PASS: TestErrHTTPStatusCodeEquals/Top-level_smithyhttp.ResponseError_matching_last_code (0.00s)
    --- PASS: TestErrHTTPStatusCodeEquals/Top-level_smithyhttp.ResponseError_no_code (0.00s)
    --- PASS: TestErrHTTPStatusCodeEquals/Top-level_smithyhttp.ResponseError_non-matching_codes (0.00s)
PASS
ok  	github.com/hashicorp/aws-sdk-go-base/v2/tfawserr	0.425s

[jar-b]

LGTM 🎉

% go test -count=1 -parallel=4 ./...
?       github.com/hashicorp/aws-sdk-go-base/v2/internal/awsconfig      [no test files]
?       github.com/hashicorp/aws-sdk-go-base/v2/internal/constants      [no test files]
?       github.com/hashicorp/aws-sdk-go-base/v2/internal/errs   [no test files]
?       github.com/hashicorp/aws-sdk-go-base/v2/internal/slices [no test files]
?       github.com/hashicorp/aws-sdk-go-base/v2/internal/test   [no test files]
?       github.com/hashicorp/aws-sdk-go-base/v2/mockdata        [no test files]
?       github.com/hashicorp/aws-sdk-go-base/v2/servicemocks    [no test files]
ok      github.com/hashicorp/aws-sdk-go-base/v2 4.791s
ok      github.com/hashicorp/aws-sdk-go-base/v2/diag    0.096s
ok      github.com/hashicorp/aws-sdk-go-base/v2/internal/config 0.298s
ok      github.com/hashicorp/aws-sdk-go-base/v2/internal/endpoints      0.242s
ok      github.com/hashicorp/aws-sdk-go-base/v2/internal/expand 0.351s
ok      github.com/hashicorp/aws-sdk-go-base/v2/logging 0.267s
ok      github.com/hashicorp/aws-sdk-go-base/v2/tfawserr        0.308s
ok      github.com/hashicorp/aws-sdk-go-base/v2/useragent       0.367s