[8.12] [Fleet] Fix get file handler for bundled package (#172182) (#173058)

[nchaulet]

Backport

This will backport the following commits from main to 8.12:

• [Fleet] Fix get file handler for bundled package (#172182) (#173058)

Questions ?

Please refer to the Backport tool documentation

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Pinging @elastic/fleet (Team:Fleet)

[apmmachine]

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