chore: cleanup all test files (#293)

## Changes made
- Removed all unused imports, and made sure type imports were labeled
correctly
- Updated all comparisons to be more strict
- Simplified loops to remove unneeded closure functions
- Removed all explicit `any` types
- Updated how strings were defined to follow general TypeScript best
practices

## Notes
- We definitely want some kind of linting setup for this repo. I'm going
to bring this up when Blueberry has its next team meeting next week

coder-login/main.test.ts

@@ -1,10 +1,5 @@
-import { describe, expect, it } from "bun:test";
-import {
-  executeScriptInContainer,
-  runTerraformApply,
-  runTerraformInit,
-  testRequiredVariables,
-} from "../test";
+import { describe } from "bun:test";
+import { runTerraformInit, testRequiredVariables } from "../test";
 
 describe("coder-login", async () => {
   await runTerraformInit(import.meta.dir);