Welcome page reskin (#9491)

* adds icons for welcome page

* updates markup and styles for welcome page

* updates color registry with welcome page colors

* updates styles for welcome page

* updates markup for welcome page

* updates theming styles for welcome page and adds date since last opened functionality on history items

* adds all icons and images for welcome page

* updates markup for welcome page

* updates styles for welcome page

* updates color registry with welcome page styles

* updates welcome page icons with microsoft flag and dark theme home banner

* updates welcome page markup

* updates dynamically generated extension list

* updates styles for welcome page

* updates markup for welcome page

* adds dynamic lists for extension pack individual extensions

* updates icons for welcome page

* updates styles for welcome page

* updates welcome page styles

* updates theme colors

* updates markup for welcome page

* updates color registry with welcomepage colors

* updates sql.de.xlf with copy for welcome page

* reverts generated file

* updates welcome page styles

* updates extension pack copy casing

* updates color registry with welcome page styles

* updates welcome page markup

* adds welcome page icons

* updates welcome page markup

* updates welcome page icons

* updates welcome page styles

* reverts color registry in vs folder to original state

* moves color registry to sql folder

* removes dead code, localizes dates

* updates welcome page styles

* moves all colors from css to color registry

* updates styles by removing all colors

* removes stat import because of laying issue, adds color registry colors to welcomePage

* updates welcome page font sizes to ems

* updates localized strings

* removes unnecessary comment

* removes double quotes around string key for single quotes

* updates welcome page styles

* updates color registry

* updates welcome page markup

* adds dropdown button functionality

* adds centering classes for installed button text

* updates welcome page styles

* updates markup and styles for welcome page

* removes icon attempt from color registry

* removes theme specific icon svgs for theme specific icon css

* removes unused import

* removes console.log

* adds back mac new file button

* removes unused rules

* updates markup

* updates markup

* updates extension links to link to extensions in ADS

* pulls in changes from welcome-page-reskin-anthonydresser

* adds back code-icon to vs folder

* reverts welcomePage.css

* removes duplicate color registry variables

* fixes icon overlap on text for mac

* removes null import

* updates welcome page styles for mac

* updates welcome page images to use sql folder

* updates welcome page markup

* updates welcome page styles

* updates styles

* updates files paths

* delete images from sql folder

* updates icons

* updates welcome page styles

* updates preview popup

* updates markup for accessibility

* adds hover state to tiles

* updates dropdown

* fixes line-height issue

* updates class names

* updates keyboard accessibility for tooltip

* format document

* updates accessibility for preview tooltip

* removes whitespace

* updates preview modal accessibility

* adds aria labels to popup and tooltip

* removes max-width for zoom

* removes escaped strings, adds keycodes to promises, marks function as async and has the return as the signature of the function

* moves keycoes to class, removes comment

* fixes promise

* testing promise

* testing promise

* promise test

* localizes copy

* uses keycode import

* removes unnecessary arguments

* formating

* refactor constructor into async function called by constructor

* attempts to fix floating promise

* removes floating promise

* moves icons and images to sql folder, removes unused icons

* uses icons already existing in ads

* updates styles

* updates color registry

* updates keycode events

* fixes issues per charles comments

* moves icons to media folder

* updates image file paths

* updates file path

* adds href to extension pack extensions

* fixes links

* fixes issues per alan's comments

* uses exisiting colors from color registry

* updates welcome page to use existing colors from color registry

* updates dark theme

* updates color registry

* updates dark theme

* formats css

* fixes dropdown arrow icon on mac

Co-authored-by: Anthony Dresser <andresse@microsoft.com>

src/sql/workbench/contrib/welcome/media/databaseIcon.svg

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