Add privacy modals to external links

[LukeSlev]

Description:

This PR adds a privacy modal to external links in our app.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Limitations:

Due to limitations in the notification api, we can't put hyperlinks into the notifications so the user will have to copy and paste the privacy link themselves.

Testing:

• The tutorials on adafruit link has the privacy modal
• the I need help notification from device deployment has the privacy modal
• the links on the notifications work as expected

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[jonathanwangg]

The user flow for getting to the tutorial feels very weird.

e.g.) There is no "OK" button to proceed to the external website on the first modal.
e.g.) From the first modal, even after clicking cancel, the second modal still pops up.

[LukeSlev]

@jonathanwangg made some changes have another look!

[jonathanwangg]

Nice changes. Thanks for the update!

[Christellah]

Small question, beside that tested and works as expected 👍

[Christellah]

In the PR 63 (https://github.com/microsoft/vscode-python-embedded/pull/63/files) about filename checks, there is another "Got it option" constant that's being added. Do we want to keep them separate ?