Fixed Golint & FGT installation commands in Project Setup Documentation

[yrs147]

Thank you for contributing to Harbor!

Comprehensive Summary of your change

The installation commands for Golint and FGT given in CONRTIBUTING.md were not working and were showing the following
Errors.

go: go.mod file not found in current directory or any parent directory.
        'go get' is no longer supported outside a module.
        To build and install a command, use 'go install' with a version,
        like 'go install example.com/cmd@latest'
        For more information, see https://golang.org/doc/go-get-install-deprecation
        or run 'go help get' or 'go help install'.
go: go.mod file not found in current directory or any parent directory.
        'go get' is no longer supported outside a module.
        To build and install a command, use 'go install' with a version,
        like 'go install example.com/cmd@latest'
        For more information, see https://golang.org/doc/go-get-install-deprecation
        or run 'go help get' or 'go help install'.

Solution: Changed the commands in the documentation of CONTRIBUTING.md that fixes this issue.

Before

go get -u golang.org/x/lint/golint
go get github.com/GeertJohan/fgt 

Changes Proposed

go install golang.org/x/lint/golint@latest
go install github.com/GeertJohan/fgt@latest

Issue being fixed

Fixes https://cloud-native.slack.com/archives/CC1E0J0MC/p1677477374149359

Please indicate you've done the following:

• Well Written Title and Summary of the PR
• Label the PR as needed. "release-note/ignore-for-release, release-note/new-feature, release-note/update, release-note/enhancement, release-note/community, release-note/breaking-change, release-note/docs, release-note/infra, release-note/deprecation"
• Accepted the DCO. Commits without the DCO will delay acceptance.
• Made sure tests are passing and test coverage is added if needed.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed in website repository.

[yrs147]

@Vad1mo

[AllForNothing]

lgtm

[OrlinVasilev]

@yrs147 congratulations on merging your first PR :)) Welcome to the club :)))

[yrs147]

Thanks @OrlinVasilev , Looking forward to contribute more