[2.x] Improve Routes facade method naming with find() and get()

[emmadesilva]

Description

This PR improves the Routes facade API by renaming methods to better communicate their behavior:

1. Renames Routes::get() (which returns null for missing routes) to Routes::find() to better indicate its trying to find, but is null safe
2. Renames Routes::getOrFail() to Routes::get() to make the exception-throwing behavior the default

Benefits:

• More predictable API: get() now fails fast with clear exceptions, matching Laravel conventions
• More descriptive naming: find() indicates it may return null
• Complete type safety: find() returns ?Route, get() returns Route

Breaking changes:

• Code using Routes::get('some-route') needs to be updated to Routes::find('some-route') if it needs to handle missing routes nullably
• Code using Routes::getOrFail('some-route') needs to be updated to Routes::get('some-route')

Migration guide:

// Old code:
$route = Routes::get('some-route'); // Returns null if not found
$route = Routes::getOrFail('some-route'); // Throws exception if not found

// New code:
$route = Routes::find('some-route'); // Returns null if not found
$route = Routes::get('some-route'); // Throws exception if not found

All internal uses have been updated to use the new method names.

Relations:

• Replaces [2.x] Merge route helper methods #2176.
• Fixes Simplify Routes facade methods #1743

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (3407099) to head (f8537d4).
Report is 5 commits behind head on 2.x-dev.

Additional details and impacted files

@@             Coverage Diff             @@
##             2.x-dev     #2179   +/-   ##
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  Coverage     100.00%   100.00%           
  Complexity      1969      1969           
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  Files            198       198           
  Lines           5265      5265           
===========================================
  Hits            5265      5265           

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