[Query Copilot] Sample Prompt implementation and other (#1489)

* Sample Prompts and ComboBox implementation

* Adding DeletePopup and SamplePrompts

* Implementation of Delete/Copy code buttons

* Adjusted changes based on the comments for Modal

* Reverded implementation of inline prompt

* Updated function

* Replacing const to function

* Unused icons deleted

* Comments removed

* Additional styling based on designs

* Test snapshots

* Implementation of popup for copying code

* Tests updated/added

* Background color changed

* Resolving lint issue

* CopyPopup snapshot updated

* Merged with master

* Implementations fixed based on comments

* Test Snapshots updated

* Query copilot updated

* Resolving minor bug with Delete popup

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Co-authored-by: Predrag Klepic <v-prklepic@microsoft.com>

images/successfulPopup.svg

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