Use golang-build-legacy and golang-test-legacy.
Use golang-build-legacy and golang-test-legacy.

Theres are identical copies of the existing ones, designed to allow
pipeline, dashboard and triggers to switch to them.

- This step uncouples the various projects so that we way then:
  switch pipeline, dashboard and triggers one at the time to a publish
  task and release pipeline that use workspaces, no resources and thus
  the catalog version of golang-build and golang-test
- once the three projects are migrated, the legacy tasks will be
  removed

See tektoncd/plumbing#734

Signed-off-by: Andrea Frittoli <4cec69a2e3f23b658ef5550bf7c5b5012f9473f7@gmail.com>

tektoncd/triggers,tektoncd/triggers