fix(ui5-card): remove max-height constraint from subtitle to prevent text clipping for tall-character languages

[tsanislavgatev]

Description

The ui5-card-header subtitle text was being visually cut off for languages
that require more vertical space per line, such as Hindi. This was caused by
a hardcoded max-height: 2.1rem on the subtitle element, which is calculated
based on Latin character height and does not accommodate the taller glyphs and
diacritics found in other scripts.

The -webkit-line-clamp: 2 rule already enforces the two-line limit correctly
for all languages, making the max-height constraint redundant and harmful.

Changes

• Removed max-height: 2.1rem from .ui5-card-header-subtitle in CardHeader.css
• Added a Cypress test to verify no max-height is applied to the subtitle

How to Test

1. Open a ui5-card-header with a subtitleText containing Hindi text, e.g.:
   आपके डिवाइस या फ़ाइल सर्वर से फ़ाइल (xlsx, csv, txt, आदि)
2. Verify the subtitle text is fully visible and not clipped at the bottom.

Before:

After:

Fixes #13379

[ui5-webcomponents-bot]

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