Improve Contrast for certain elements in the Issue stream for Accessibility

### Problem Statement

Several of the changes made recently to the issues page has made it harder to read for some users.

I believe the main offender is that we removed the border and color from the issue status and the light gray on white background makes it very hard to read for some users.

The session graph itself looks like the gray bars on it may have been lightened.

Some of the design changes to make it more minimal such as the movement of the event level flag to a small colored dot under the error type contributes to the lack of readability as well.

I am comparing the **Before** found on this page: [https://docs.sentry.io/product/issues/](https://docs.sentry.io/product/issues/ )-

With the **After** here in my org -

### Solution Brainstorm

Increase contrast or return color to some of the elements

### Product Area

Issues