BIT-2438: Update push notification processing logic to be more lenient

[david-livefront]

🎟️ Tracking

BIT-2438

📔 Objective

This PR updates the logic for processing notifications to parse the payloads assuming anything can be null.

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[github-actions[bot]]

Checkmarx One – Scan Summary & Details – b42207c4-4252-44c2-bbc4-fed21c27c60d

No New Or Fixed Issues Found

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 57.89474% with 32 lines in your changes missing coverage. Please review.

Project coverage is 85.58%. Comparing base (f5039d7) to head (29aba7c).

Files	Patch %	Lines
...bitwarden/data/platform/manager/PushManagerImpl.kt	57.89%	0 Missing and 32 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3393 +/- ## ========================================== - Coverage 85.65% 85.58% -0.08% ========================================== Files 356 356 Lines 28922 28937 +15 Branches 5015 5039 +24 ========================================== - Hits 24774 24766 -8 Misses 2123 2123 - Partials 2025 2048 +23 ```

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[david-livefront]

Thanks @brian-livefront