Introduce sig-instrumentation aliases in OWNERS_ALISES and simplify OWNERS files

test/e2e/instrumentation/OWNERS

@@ -3,8 +3,10 @@
 approvers:
 - fabxc
 - fgrzadkowski
-- piosz
+- sig-instrumentation-approvers
 - x13n
 - kawych
 reviewers:
-- sig-instrumentation-pr-reviews
+- sig-instrumentation-reviewers
+labels:
+- sig/instrumentation

test/e2e/instrumentation/logging/OWNERS

@@ -1,10 +1,10 @@
 # See the OWNERS docs at https://go.k8s.io/owners
 
-reviewers:
-  - coffeepac
-  - monotek
-  - piosz
 approvers:
-  - coffeepac
-  - monotek
-  - piosz
+- coffeepac
+- monotek
+- sig-instrumentation-approvers
+reviewers:
+- sig-instrumentation-reviewers
+labels:
+- sig/instrumentation

test/instrumentation/OWNERS

@@ -1,12 +1,9 @@
 # See the OWNERS docs at https://go.k8s.io/owners
 
 approvers:
-- piosz
-- brancz
+- sig-instrumentation-approvers
 - logicalhan
 reviewers:
-- piosz
-- brancz
-- logicalhan
+- sig-instrumentation-reviewers
 labels:
 - sig/instrumentation

test/instrumentation/testdata/OWNERS

@@ -1,11 +1,8 @@
 # See the OWNERS docs at https://go.k8s.io/owners
 
 approvers:
-- piosz
-- brancz
+- sig-instrumentation-approvers
 reviewers:
-- piosz
-- brancz
-- logicalhan
+- sig-instrumentation-reviewers
 labels:
 - sig/instrumentation