Adds 'unsure' reasons buttons to new Validate beta

[misaugstad]

Resolves #3581

Adds buttons with 'Unsure' reasons to the new Validate page. We can and should iterate on the options that I've added in for now. The options came from Jon and I brainstorming, and looking through reasons that users have manually entered during previous Unsure validations. I'm starting with the following showing up for all label types:

• Need a better image
  • This has an associated tooltip with the text: "This could be because the image is blurry, what's being labeled is too far away, or a different angle is needed"
• Label placement looks incorrect

And then a third option for a few label types:

• Curb Ramp: Alley or parking lot entrance
• Missing Curb Ramp: Not sure if a curb ramp is required
• Obstacle: Not sure if sidewalk is wide enough to avoid the obstacle
• Surface Problem: Might be too minor to label
• No Sidewalk: Not sure if there should be a sidewalk here
• Crosswalk & Pedestrian Signal: None, I couldn't think of any good ones yet!

Before/After screenshots (if applicable)

Before

After:
Curb Ramp

Tooltip:

Missing Curb Ramp

Obstacle

Surface Problem

No Sidewalk

Crosswalk & Pedestrian Signal

Things to check before submitting the PR

• I've written a descriptive PR title.
• I've added/updated comments for large or confusing blocks of code.
• I've included before/after screenshots above.
• I've asked for and included translations for any user facing text that was added or modified.
• I've updated any logging. Clicks, keyboard presses, and other user interactions should be logged. If you're not sure how (or if you need to update the logging), ask Mikey. Then make sure the documentation on this wiki page is up to date for the logs you added/updated.