Handle the code path for OSS keras PIP package when filtering error message.
Handle the code path for OSS keras PIP package when filtering error message.

When running from OSS env, the keras package will be read from PIP package installation, and the code location can be vary based on different version and platform. We use "keras" as a keyword to match for now.

PiperOrigin-RevId: 379338794
Change-Id: I3e14527008f4077febc587fcdb2d4727f8b238a6

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