[email protected]: include major_minor version in pear path

[aguthrie]

this is how it's done in other old versions and is required to support multiple versions installed at once

without this, both [email protected] and php(@8.4) point to the same pear directory, and cannot use separate pear extension versions

we copy over the previous non-versioned directory if one exists to
ensure any existing pecl install data is retained

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• Have you ensured that your commits follow the commit style guide?
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• Have you built your formula locally with HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
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[botantony]

Blocked by this PR #253247

[daeho-ro]

Can you squash your commits to the first one?

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⚠️ Bottle publish failed.

[chenrui333]

• icu4c@78 78.1 (new formula) #253247

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