Teams dropdown bug (#11122)

## Addresses #10756
https://www.loom.com/share/b5ba605b892c4c789a73f05d160819cc
- Set the teams dropdown's max-height to be 66% of the viewport height
- Made a small script to automate creation of an arbitrary number of
teams
- [x] Changes file added for user-visible changes in `changes/` 
- [x] Manual QA for all new/changed functionality

---------

Co-authored-by: Jacob Shandling <jacob@fleetdm.com>

changes/10756-teams-dropdown-erratic-behavior

@@ -0,0 +1,2 @@
+- Added a maximum height to the teams dropdown, allowng the user to scroll through a large number of
+  teams

frontend/components/TeamsDropdown/_styles.scss

@@ -22,7 +22,7 @@
 
   .Select-menu {
     padding-right: $pad-small; // moves scrollbar to edge of dropdown
-    max-height: none;
+    max-height: 66vh;
   }
 
   .Select-menu-outer {

tools/api/fleet/teams/create_n_teams

@@ -0,0 +1,29 @@
+#!/usr/bin/python3
+
+'''
+Create n new teams, each with a randomly generated 5-letter name, where n is the integer first
+argument passed to the script. Assumes all relevant environment variables are set.
+'''
+
+import subprocess, os, sys, string, random
+
+def main(n: int):
+  token, server_url = os.environ.get("TOKEN"), os.environ.get("SERVER_URL")
+  if not token or not server_url:
+    raise Exception("Make sure you have set TOKEN and SERVER_URL as environment variables.")
+  for i in range(n):
+    name = "Team " + ''.join(random.choices(string.ascii_lowercase, k=5)).capitalize()
+    data = f'{{"name": "{name}"}}'
+    print(data)
+    subprocess.run(
+      ["curl", "-X", "POST", "-k", "-s", "-H", f"Authorization: Bearer {token}", f"{server_url}/api/latest/fleet/teams", "-d", f"{data}", "--insecure"]
+    )
+
+
+
+if __name__ == "__main__":
+    try:
+      n = int(sys.argv[1])
+    except:
+      raise Exception("Enter the number of teams to create as a single integer argument to this script.")
+    main(n)