remove support for FIPS 140-2 with boringcrypto (#21292)

This commit removes FIPS 140-2 related code for the following
reasons:
 - FIPS 140-2 is a compliance, not a security requirement. Being
   FIPS 140-2 compliant has no security implication on its own.
   From a tech. perspetive, a FIPS 140-2 compliant implementation
   is not necessarily secure and a non-FIPS 140-2 compliant implementation
   is not necessarily insecure. It depends on the concret design and
   crypto primitives/constructions used.
 - The boringcrypto branch used to achieve FIPS 140-2 compliance was never
   officially supported by the Go team and is now in maintainance mode.
   It is replaced by a built-in FIPS 140-3 module. It will be removed
   eventually. Ref: https://github.com/golang/go/issues/69536
 - FIPS 140-2 modules are no longer re-certified after Sep. 2026.
   Ref: https://csrc.nist.gov/projects/cryptographic-module-validation-program

Signed-off-by: Andreas Auernhammer <github@aead.dev>

.github/workflows/go-fips.yml

@@ -1,59 +0,0 @@
-name: FIPS Build Test
-
-on:
-  pull_request:
-    branches:
-      - master
-
-# This ensures that previous jobs for the PR are canceled when the PR is
-# updated.
-concurrency:
-  group: ${{ github.workflow }}-${{ github.head_ref }}
-  cancel-in-progress: true
-
-permissions:
-  contents: read
-
-jobs:
-  build:
-    name: Go BoringCrypto ${{ matrix.go-version }} on ${{ matrix.os }}
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        go-version: [1.24.x]
-        os: [ubuntu-latest]
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-go@v5
-        with:
-          go-version: ${{ matrix.go-version }}
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
-
-      - name: Setup dockerfile for build test
-        run: |
-          GO_VERSION=$(go version | cut -d ' ' -f 3 | sed 's/go//')
-          echo Detected go version $GO_VERSION
-          cat > Dockerfile.fips.test <<EOF
-          FROM golang:${GO_VERSION}
-          COPY . /minio
-          WORKDIR /minio
-          ENV GOEXPERIMENT=boringcrypto
-          RUN make
-          EOF
-
-      - name: Build
-        uses: docker/build-push-action@v3
-        with:
-          context: .
-          file: Dockerfile.fips.test
-          push: false
-          load: true
-          tags: minio/fips-test:latest
-
-      # This should fail if grep returns non-zero exit
-      - name: Test binary
-        run: |
-          docker run --rm minio/fips-test:latest ./minio --version
-          docker run --rm -i minio/fips-test:latest /bin/bash -c 'go tool nm ./minio | grep FIPS | grep -q FIPS'