feat(vrl): update vrl-vm to be a runtime option. (#11554)

* Update vrl-vm to be a runtime option.

Signed-off-by: Stephen Wakely <fungus.humungus@gmail.com>

* Use an enum instead of a boolean.

Signed-off-by: Stephen Wakely <fungus.humungus@gmail.com>

* Fix CI checks.

Signed-off-by: Stephen Wakely <fungus.humungus@gmail.com>

* Fixed bad merge.

Signed-off-by: Stephen Wakely <fungus.humungus@gmail.com>

* Fix unused variable name.

Signed-off-by: Stephen Wakely <fungus.humungus@gmail.com>