fix(ci): estate-wide structural CI fixes

- grant secret-scanner reusable its requested job permissions
- drop invalid timeout-minutes on reusable-call jobs
- drop hashFiles() from job-level if: expressions

Author: hyperpolymath

.github/workflows/governance.yml

@@ -17,4 +17,3 @@ permissions:
 jobs:
   governance:
     uses: hyperpolymath/standards/.github/workflows/governance-reusable.yml@d7c22711e830e1f383846472f6e9b99debdb201e
-    timeout-minutes: 10

.github/workflows/hypatia-scan.yml

@@ -26,4 +26,3 @@ permissions:
 jobs:
   scan:
     uses: hyperpolymath/standards/.github/workflows/hypatia-scan-reusable.yml@d7c22711e830e1f383846472f6e9b99debdb201e
-    timeout-minutes: 20

.github/workflows/mirror.yml

@@ -12,5 +12,4 @@ permissions:
 jobs:
   mirror:
     uses: hyperpolymath/standards/.github/workflows/mirror-reusable.yml@09e7023d24682621bea4e11965a1ef5e87d86c3b
-    timeout-minutes: 10
     secrets: inherit

.github/workflows/secret-scanner.yml

@@ -17,6 +17,9 @@ permissions:
 # .github/workflows/README.adoc.
 jobs:
   scan:
+    permissions:
+      contents: read
+      pull-requests: write
+      actions: read
     uses: hyperpolymath/standards/.github/workflows/secret-scanner-reusable.yml@09e7023d24682621bea4e11965a1ef5e87d86c3b
-    timeout-minutes: 10
     secrets: inherit