fix: encryption salt key is not any random string

[pauldambra]

follow-up to #25479

this continues to be the gift that gives

now plugin server does not start because

{"level":"error","time":1728490554991,"pid":36,"hostname":"f01ec11b8962","error":"Error: Key must be 32-byte long base64url encoded string.\n at Fernet.checkKey (/code/plugin-server/node_modules/.pnpm/[email protected]/node_modules/fernet-nodejs/dist/Fernet.js:28:19)\n

so

• generate a 32 byte long base64 url encoded string
• add that if it isn't present when upgrading
• replace an incorrect key if present when upgrading (because someone may have a broken key from fix: encryption salt keys take 2 #25479

[github-actions]

Size Change: 0 B

Total Size: 1.13 MB

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Filename	Size
frontend/dist/toolbar.js	1.13 MB

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