Fix connection string env var precedence over ${file:...} config lookup#4608
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Fix #4214.
Using a base applicationinsights.json with
${file:...}across environments (e.g. dev, prod) cannot fall back to the env var in environments where the secret file isn't mounted.The fix defers the file lookup using a
Supplier<String>, so the file is only read when no env var or system property override is present.