Audit the IS22 cohort labels and milestones and make new ones

### Dependencies
None

### Overview
We need to have up-to-date milestones and labels so that we can prioritize issues quickly and add all relevant labels easily.

### Action Items

- [x] Review the 2022 Internship Process Overview in the WIKI to determine what labels could be helpful
- [x] Review the IS22 Timeline/Milestone spreadsheet
- [x] Create a sheet with proposed feature labels
- [ ] Review with Bonnie

```
- [ ] Look at all issues that do not have each label type and apply any that already exist
- [ ] feature
- [ ] milestone
- [ ] Create a list of feature labels needed that do not exist (in a comment below)
- [ ] Look at the roadmap spreadsheet to figure out where those issues fit and confirm that the label proposals make sense
```
### Resources/Instructions

#### Drafts
- [Proposed Cohort Feature Labels](https://docs.google.com/spreadsheets/d/1rELYpwDNs_HQSkQvjr0JX2UmHBSKJD6PT1XXoHk9Phs/edit#gid=1261177898)
- [Events Timeline](https://docs.google.com/spreadsheets/d/1rELYpwDNs_HQSkQvjr0JX2UmHBSKJD6PT1XXoHk9Phs/edit#gid=0)

#### Relevant Issues
- #54
- #93 (see this issue for links to missing labels for features and milestones)