chore(cli): show warning when using deprecated version

[tttol]

Fixes aws/aws-cdk#298

What I changed

Show the warning message when Toolkit uses deprecated version of aws-cdk. The message is like below.

You are using deprecated version(aws-cdk@X.X.X): This version has been deprecated

Additional information

• I'm new to aws-cdk.
• I didn't submit PR to aws-cdk-cli-testing because I think that integration test is not needed in my change. But I am not confident in my judgment. Please let me know if additional integration tests are needed.

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[rix0rrr]

Can you work this into the existing version check in some way? (it may be that you will need to change that existing check to return information about more than 1 version at a time).

I'd like to avoid doing unnecessary calls to NPM.

[tttol]

@rix0rrr
It's true that my implementation results in unnecessary NPM calls. But I couldn't find the logic of version check in existing source code. Which logic/file are you referring when you said work this into the existing version check?

[rix0rrr]

We're doing upgrade notice work here already: https://github.com/aws/aws-cdk-cli/blob/huijbers/install-deps/packages/aws-cdk/lib/cli/version.ts/#L86

[tttol]

@rix0rrr
Do you mean that calling checkIfDeprecated out of if (laterVersion) block is better?
Ref: https://github.com/aws/aws-cdk-cli/blob/main/packages/aws-cdk/lib/cli/version.ts#L125

    try {
      const laterVersion = await latestVersionIfHigher(currentVersion, versionCheckCache ?? new VersionCheckTTL());
+    const deprecationMessage = await checkIfDeprecated(currentVersion);
+    if (deprecationMessage) {
+      info(`You are using deprecated version(aws-cdk@${currentVersion}): ${deprecationMessage}`);
+    }
      if (laterVersion) {
        const versionMessage = await getVersionMessage(currentVersion, laterVersion);