Fix #279: Add link to upgrade notes to news text

[samdark]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues	#279

[Copilot]

Pull Request Overview

Adds a conditional link to the repository’s UPGRADE.md in the release summary and ensures the output is trimmed before printing.

• Initialized and populated an $upgradeNotesLink when UPGRADE.md exists
• Incorporated the link into the release message heredoc
• Trimmed the final message before passing it to $io->info()

Comments suppressed due to low confidence (2)

src/App/Command/Release/MakeCommand.php:311

• Add tests to verify that the upgrade notes link is shown when UPGRADE.md exists and omitted when it does not, to prevent regressions.

if (file_exists($upgradePath)) {

src/App/Command/Release/MakeCommand.php:312

• To avoid potential issues with special characters in the package name or version, consider wrapping $packageName and $versionToRelease in rawurlencode() when building the URL.

$upgradeNotesLink = "\n\nSee [UPGRADE.md](https://github.com/yiisoft/$packageName/blob/$versionToRelease/UPGRADE.md) for upgrade notes.";

[Copilot]

[nitpick] Consider using is_file() instead of file_exists() to ensure the path points to a regular file rather than a directory.

Suggested change

	if (file_exists($upgradePath)) {
	if (is_file($upgradePath)) {

[vjik]

It needs for major releases only.

[rustamwin]

It would be good if we link to exact notes with anchor. For example:

Suggested change

	$upgradeNotesLink = "\n\nSee [UPGRADE.md](https://github.com/yiisoft/$packageName/blob/$versionToRelease/UPGRADE.md) for upgrade notes.";
	$upgradeNotesLink = "\n\nSee [UPGRADE.md](https://github.com/yiisoft/$packageName/blob/$versionToRelease/UPGRADE.md#1-0) for upgrade notes.";

[samdark]

Tricky since header in these notes is created manually and doesn't correspond to version being released.