Do not create Github worker for deleting workspace

[ArtyomSavchenko]

Fix cases when Github worker is creating for deleting workspaces:

{"index":456,"level":"info","message":"************************* Register worker ************************* ","mode":"pending-deletion","timestamp":"2026-03-21T09:10:34.015Z","total":1141,"versionMajor":0,"versionMinor":7,"versionPatch":186,"workspace":"67b149dc-8098-4ff7-8df0-9aa3bc98026c","workspaceId":"67b149dc-8098-4ff7-8df0-9aa3bc98026c","workspaceUrl":"vectorcostarica"}
{"level":"info","message":"Connecting to","timestamp":"2026-03-21T09:10:34.015Z","workspace":{"dataId":"w-lvillalobos-vectorcostar-67acd519-c017060e71-6ee77c","url":"vectorcostarica","uuid":"67b149dc-8098-4ff7-8df0-9aa3bc98026c"}}

[huly-github-staging]

Connected to Huly®: UBERF-15992