Log hello message in browser console

• Introduce FE lib/logger for errors
• Log hello message in browser console
• Add logging docs to FE guide

What does this MR do?

This MR adds a hello message to the browser console, welcoming the user to GitLab and prompting them to contribute if they notice any improvements or issues.

Screenshots or Screencasts (strongly suggested)

• UPDATE: The console no longer logs View GitLab issues but instead Create a new GitLab issue with a link to https://gitlab.com/gitlab-org/gitlab/-/issues/new

Description	Screenshot
Firefox
Safari
Chrome
Chrome + Performance Bar

How to setup and validate locally (strongly suggested)

Simply open up the browser's developer console.

Does this MR meet the acceptance criteria?

Conformity

• I have included changelog trailers, or none are needed. (Does this MR need a changelog?)
• I have added/updated documentation, or it's not needed. (Is documentation required?)
• I have properly separated EE content from FOSS, or this MR is FOSS only. (Where should EE code go?)
• I have added information for database reviewers in the MR description, or it's not needed. (Does this MR have database related changes?)
• I have self-reviewed this MR per code review guidelines.
• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.
• This change is backwards compatible across updates, or this does not apply.

Availability and Testing

• I have added/updated tests following the Testing Guide, or it's not needed. (Consider all test levels. See the Test Planning Process.)
• I have tested this MR in all supported browsers, or it's not needed.