fix: ensure unique mountPath when service has multiple secrets

[fru1tworld]

What type of PR is this?

/kind bug

What this PR does / why we need it:

When a service references multiple secrets, compose-go normalizes
short-syntax secrets: [a, b] to long-syntax with
Target="/run/secrets/<name>". getSecretPathsLegacy then stripped the
filename and used only the parent directory as mountPath, so both
secrets ended up with mountPath: /run/secrets and kubectl apply failed
with volumeMounts[*].mountPath: must be unique.

Use the full target as the mountPath. SubPath still selects the file
within the secret data, so the file lands at the same location.

Which issue(s) this PR fixes:

Fixes #1894

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: fru1tworld / name: fru1tworld (593543b, 75f5b98)

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