feedback - Removed usages and references of @backstage/backend-common

[awanlin]

Hey, I just made a Pull Request!

Removed usages and references of @backstage/backend-common

✔️ Checklist

• A changeset describing the change and affected packages. (more info)
• Added or updated documentation
• Tests for new functionality and regression tests for bug fixes
• Screenshots attached (for UI changes)
• All your commits have a Signed-off-by line in the message. (more info)

[backstage-goalie]

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@backstage-community/plugin-feedback-backend	workspaces/feedback/plugins/feedback-backend	patch	v1.7.7

[awanlin]

Hi @yashoswalyo and @riginoommen, more than happy to make changes to this based on your feedback. As @backstage/backend-common has been deprecated and I believe now has an active CVE I'm trying to remove it from all the plugins.

[awanlin]

I've made some corrections but I'll need your feedback as to how best to resolve the API Report errors in the CI. It want me to export the RouterOptions but ideally we should be removing that and the export of createRouter and pushing Adopters to using the New Backend System.

[awanlin]

Reason for closing outlined here: #1176 (comment)