Revert "rtpbin: receive bundle support"

This reverts commit dcd3ce97.

This functionality was implemented for gstopenwebrtc, but it
turned out this was not actually needed for webrtc bundling
support, as shown in webrtcbin. It also doesn't correspond
to any standards.

This is an API break, but nothing should actually depend on
this, at least not for its initial purpose.

Changes in rtpbin.c were reverted manually, to preserve some
refactoring that had occurred in the original commit.

Fixes #537
8 jobs for rtpbin_revert_bundle in 31 minutes and 26 seconds (queued for 3 seconds)
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  Preparation
passed #68278
gst indent

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passed #68277
manifest

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  Build
passed #68279
build fedora x86_64

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  Test
passed #68450
check fedora

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failed #68419
check fedora

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failed #68280
check fedora

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  Full Builds
passed #68281
build android arm64 api28

00:03:21

passed #68282
build cerbero fedora x86_64

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