[SITES-20282] Authors unable to select Excel and Word documents into dialog

[YahorC]

Adding for DownloadV2 component possibility to upload Xlsx files. Also adding integration test for this scenario.

Q	A
Fixed Issues?	Fixes #1, Fixes #2
Patch: Bug Fix?
Minor: New Feature?
Major: Breaking Change?
Tests Added + Pass?	Yes
Documentation Provided	Yes (code comments and or markdown)
Any Dependency Changes?
License	Apache License, Version 2.0

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.16%. Comparing base (af5c4e8) to head (6251873).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2709 +/- ## ========================================= Coverage 87.16% 87.16% Complexity 2668 2668 ========================================= Files 233 233 Lines 7128 7128 Branches 1090 1090 ========================================= Hits 6213 6213 Misses 363 363 Partials 552 552 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud