feat(connector-fabric): drop support for Fabric v1.x

[petermetz]

BREAKING CHANGE: The Open API specification that has the enums for
ledger versions will no longer have an option for Fabric v1.x
This means that in the core-api package the LedgerType enum has changes
which means that code that depends on that enum value will need to be
updated.

Fabric v1.x has had unmaintained dependencies associated with it such as
the native grpc package that stopped receiving security updates years ago
and therefore it's dangerous to have around.

There are also some issues with Fabric v1.x that make the AIO image flaky
which also makes the relevant tests flaky due to which we couldn't run
the v1.x Fabric tests on the CI for a while now anyway.

In order to reduce the CI resource usage and our own maintenance burden
I suggest that we get rid of the Fabric v1.x support meaning that we can
eliminate the AIO image build and some code complexity from the test ledger
code as well.

In addition some old fixtures can be removed that the tests were using.
Overall a net-positive as deleting code without losing functionality (that
we care about) is always a plus.

Signed-off-by: Peter Somogyvari [email protected]

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A Must Read for Beginners
For rebasing and squashing, here's a must read guide for beginners.