feat(argo-cd): REDIS_USERNAME environment variable added automatically based on externalRedis.username

[EugeneLugovtsov]

Signed-off-by: Eugene Lugovtsov [email protected]

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Checklist:

• [x] I have bumped the chart version according to versioning
• [x] I have updated the documentation according to documentation
• [x] I have updated the chart changelog with all the changes that come with this pull request according to changelog.
• [x] Any new values are backwards compatible and/or have sensible default.
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• [x] My build is green (troubleshooting builds).

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