Increase CI build timeouts. (#26954)

Saw coverage hit timeout in https://github.com/project-chip/connectedhomeip/actions/runs/5123311349/jobs/9213629956?pr=26952

Saw QPG timeout in https://github.com/project-chip/connectedhomeip/actions/runs/5123311361/jobs/9213628661

Co-authored-by: Andrei Litvin <andreilitvin@google.com>

.github/workflows/build.yaml

@@ -528,5 +528,5 @@ jobs:
  .environment/pigweed-venv/*.log
 
  - name: Run Build Coverage
- timeout-minutes: 20
+ timeout-minutes: 30
  run: ./scripts/build_coverage.sh

.github/workflows/examples-qpg.yaml

@@ -82,7 +82,7 @@ jobs:
  .environment/pigweed-venv/*.log
 
  - name: Build QPG6105 example apps
- timeout-minutes: 20
+ timeout-minutes: 30
  run: |
  ./scripts/run_in_build_env.sh \
  "./scripts/build/build_examples.py \