Remove guards from e2e-test-kind, pr-linter-check, nightly-trivy-scan

Per review feedback, these workflows are useful on forks:
- e2e-test-kind: tests pass on downstream forks
- pr-linter-check: keeps lint up to date for upstream-bound features
- nightly-trivy-scan: wanted in downstream forks

Also remove changelog file per reviewer request.

Signed-off-by: Shubham Pampattiwar <spampatt@redhat.com>

.github/workflows/e2e-test-kind.yaml

@@ -17,7 +17,6 @@ jobs:
 
   # Build the Velero CLI and image once for all Kubernetes versions, and cache it so the fan-out workers can get it.
   build:
-    if: github.repository == 'velero-io/velero'
     runs-on: ubuntu-latest
     needs: get-go-version
     outputs:
@@ -82,7 +81,6 @@ jobs:
   # Create json of k8s versions to test
   # from guide: https://stackoverflow.com/a/65094398/4590470
   setup-test-matrix:
-    if: github.repository == 'velero-io/velero'
     runs-on: ubuntu-latest
     env:
       GH_TOKEN: ${{ github.token }}
@@ -108,7 +106,6 @@ jobs:
 
   # Run E2E test against all Kubernetes versions on kind
   run-e2e-test:
-    if: github.repository == 'velero-io/velero'
     needs:
       - build
       - setup-test-matrix

.github/workflows/nightly-trivy-scan.yml

@@ -5,7 +5,6 @@ on:
 
 jobs:
   nightly-scan:
-    if: github.repository == 'velero-io/velero'
     name: Trivy nightly scan
     runs-on: ubuntu-latest
     strategy:

.github/workflows/pr-linter-check.yml

@@ -13,7 +13,6 @@ jobs:
       ref: ${{ github.event.pull_request.base.ref }}
 
   build:
-    if: github.repository == 'velero-io/velero'
     name: Run Linter Check
     runs-on: ubuntu-latest
     needs: get-go-version

changelogs/unreleased/10001-shubham-pampattiwar

@@ -1 +0,0 @@
-Skip upstream-only workflows on forks