correct license years & preamble

[intrand]

This PR fixes #

Checklist

• I have signed the CLA
• I have updated/added any relevant documentation

Description

What's the goal of this PR?

provide accurate copyright information where appropriate

What changes did you make?

1. Determined which .go files had the copyright preamble:

   find . -type f -not -path "./.git*" -not -path "./.*" -iname "*.go" -exec grep -HcE "Copyright 202[0-9] Fairwinds" {} \; | grep -v 'go:0'

2. Manually add preambles to any .go files which didn't contain them.

3. Remove the first two lines from all .go files:

   for i in $(find . -type f -not -path "./.git*" -not -path "./.*" -iname "*.go" -exec grep -HcE "Copyright 202[0-9] Fairwinds" {} \; | grep -v 'go:0' | cut -d':' -f1); do awk -i inplace 'NR > 2' "${i}"; done;

What alternative solution should we consider, if any?

n/a

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[sudermanjr]

Thanks!