When importing SpreadsheetML ss:DateTime, import the entire value, not only the
first 19 characters.

Add a test file for this bug.

Fixes: #128554 - Office 2003 SpreadsheetML: fr

When importing SpreadsheetML ss:DateTime, import the entire value, not only the
first 19 characters.

Add a test file for this bug.

Fixes: #128554 - Office 2003 SpreadsheetML: fractional seconds are silently
ignored during import
Patch by: me

(cherry picked from commit 195282cf3d8bfaa9e1cec43b093251d9df87f4ba)

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