manifest: bsim: Do not import but replicate in main manifest

[aescolar]

manifest: bsim: Do not import but replicate in main manifest

Due to a limitation in the west import feature,
a project cannot both have an import and be part of a group.
Moreover, when a project has an import and is not filtered
out, it is required for that project to be present
for most west commands to work.

As the bsim project is not filtered by default,
it causes trouble for users who never run a
west update but try to use west further.

To work around this issue, let's disable the import
in the bsim project, and instead replicate its content
inside Zephyr's main manifest.

Having a replica of the babblesim manifest content
is likely to cause some confusion in users,
wrt to which version of components they are using.
So whenever west supports both imports and groups, or another
simple and nicer way of working around this, it should be used.

Fixes #57198

[zephyrbot]

The following west manifest projects have been modified in this Pull Request:

Name	Old Revision	New Revision	Diff
babblesim_base	None	02838ca04c4562e68dc876196828d8121679e537	N/A
babblesim_ext_2G4_channel_NtNcable	None	20a38c997f507b0aa53817aab3d73a462fff7af1	N/A
babblesim_ext_2G4_channel_multiatt	None	e09bc2d14b1975f969ad19c6ed23eb20e5dc3d09	N/A
babblesim_ext_2G4_device_WLAN_actmod	None	9cb6d8e72695f6b785e57443f0629a18069d6ce4	N/A
babblesim_ext_2G4_device_burst_interferer	None	5b5339351d6e6a2368c686c734dc8b2fc65698fc	N/A
babblesim_ext_2G4_device_playback	None	85c645929cf1ce995d8537107d9dcbd12ed64036	N/A
babblesim_ext_2G4_libPhyComv1	None	9018113a362fa6c9e8f4b9cab9e5a8f12cc46b94	N/A
babblesim_ext_2G4_modem_BLE_simple	None	ce975a3259fd0dd761d371b60435242d54794bad	N/A
babblesim_ext_2G4_modem_magic	None	cb70771794f0bf6f262aa474848611c68ae8f1ed	N/A
babblesim_ext_2G4_phy_v1	None	cf2d86e736efac4f12fad5093ed2da2c5b406156	N/A
babblesim_ext_libCryptov1	None	eed6d7038e839153e340bd333bc43541cb90ba64	N/A

Note: This message is automatically posted and updated by the Manifest GitHub Action.

[carlescufi]

The changes themselves LGTM, but before we merge this we need to decide betweent this approach and #57361.