Hide "Add New" btn in Submission Dashboard

[Soare-Robert-Daniel]

Closes #1810

Summary

Add CSS to hide the "Add New" button. This way it will prevent the user from accidentally creating a submission.

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Test instructions

• Install Otter Pro on a WordPress multisite installation.
• Create multiple sites and visit one of them while being logged in using the super admin user of the network
• Visit Otter Blocks > Form Submissions -> There is should NO "Add New" button.

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Checklist before the final review

• Included E2E or unit tests for the changes in this PR.
• Visual elements are not affected by independent changes.
• It is at least compatible with the minimum WordPress version.
• It loads additional script in frontend only if it is required.
• Does not impact the Core Web Vitals.
• In case of deprecation, old blocks are safely migrated.
• It is usable in Widgets and FSE.
• Copy/Paste is working if the attributes are modified.
• PR is following the best practices

[pirate-bot]

Bundle Size Diff

Package	Old Size	New Size	Diff
Animations	270.78 KB	270.78 KB	0 B (0.00%)
Blocks	1.41 MB	1.41 MB	0 B (0.00%)
CSS	85.28 KB	85.28 KB	0 B (0.00%)
Dashboard	122.49 KB	122.49 KB	0 B (0.00%)
Export Import	83.17 KB	83.17 KB	0 B (0.00%)
Pro	302.52 KB	302.52 KB	0 B (0.00%)

[pirate-bot]

Plugin build for 3c41ba6 is ready 🛎️!

• Download Otter – Page Builder Blocks & Extensions for Gutenberg - Production ~ Development
• Download Otter Pro - Production ~ Development
• Download Blocks Animation - Production ~ Development
• Download Blocks CSS - Production ~ Development
• Download Blocks Export Import - Production ~ Development

[pirate-bot]

E2E Summary

Typing

Test	Average Time (ms)	Standard Deviation (ms)	Median Time (ms)	Quantile for soft limit (%)	Quantile for hard limit (%)
Typing	70.28	9.37	67.73	0 (60ms)	84.21 (80ms)

Values above 60ms

"0 - 73.47, 1 - 60.58, 2 - 61.62, 3 - 63.86, 4 - 70.07, 5 - 63.74, 6 - 63.03, 7 - 65.11, 8 - 69.02, 9 - 67.50, 10 - 96.22, 11 - 63.44, 12 - 70.38, 13 - 91.40, 14 - 81.03, 15 - 68.30, 16 - 72.90, 17 - 67.73, 18 - 65.99"

[pirate-bot]

🎉 This PR is included in version 2.3.4 🎉

The release is available on GitHub release

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