Add changelog entry for #7250

Author: Mikolaj

changelog.d/pr-7250

@@ -0,0 +1,11 @@
+synopsis: Fix test --enable-coverage for multi-package projects
+packages: Cabal
+prs: #7250 #7467
+issues: #5433 #5213 #7200
+significance: significant
+description: {
+
+- Fix `cabal test --enable-coverage` for multi-package projects.
+- Ban `--exclude=` and enable `--include=` in `hpc markup` invocations.
+
+}