Add context for versions:bump about version change and update tests

Signed-off-by: Shashank Bairy R <shashank.bairy04@gmail.com>

packages/cli/src/commands/versions/bump.test.ts

@@ -136,7 +136,7 @@ describe('bump', () => {
       'bumping @backstage/theme in b to ^2.0.0',
       'Running yarn install to install new versions',
       '⚠️  The following packages may have breaking changes:',
-      '  @backstage/theme',
+      '  @backstage/theme : 1.0.0 ~> 2.0.0',
       '    https://github.com/backstage/backstage/blob/master/packages/theme/CHANGELOG.md',
       'Version bump complete!',
     ]);

packages/cli/src/commands/versions/bump.ts

@@ -195,8 +195,14 @@ export default async () => {
       );
       console.log();
 
-      for (const name of Array.from(breakingUpdates.keys()).sort()) {
-        console.log(`  ${chalk.yellow(name)}`);
+      for (const [name, { from, to }] of [
+        ...breakingUpdates.entries(),
+      ].sort()) {
+        console.log(
+          `  ${chalk.yellow(name)} : ${chalk.yellow(from)} ~> ${chalk.yellow(
+            to,
+          )}`,
+        );
 
         let path;
         if (name.startsWith('@backstage/plugin-')) {