[Bug] - Incorrectly handled absolute paths

[mishushakov]

another go at the effort started in #1057

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Note

Improves COPY handling to support absolute and escaped-relative paths by normalizing sources and attaching a per-instruction contextPath used end-to-end.

• Introduces normalizeCopySourcePath/normalize_copy_source_path; COPY now stores normalized src and contextPath
• Updates hashing/upload flow to use instruction.contextPath for calculateFilesHash, readDockerignore, and uploadFile
• Adjusts globbing/tar behavior to handle absolute patterns (no cwd, POSIX paths) in getAllFilesInPath and tar path construction
• Extends Instruction types with optional contextPath
• Adds JS and Python (sync/async) tests for absolute-path COPY scenarios

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