Refactor FXIOS-9151 Tab count log message

[mattreaganmozilla]

📜 Tickets

Jira ticket
Github issue

💡 Description

Minor update to tab count log message to make the output more clear for multi-window users:

1 window ex:
"Tab manager is preserving 2 tabs (1 window)"

>1 window ex:
"Tab manager is preserving 2 tabs (of 3 total tabs across 2 windows)"

📝 Checklist

You have to check all boxes before merging

• Filled in the above information (tickets numbers and description of your work)
• Updated the PR name to follow our PR naming guidelines
• Wrote unit tests and/or ensured the tests suite is passing
• When working on UI, I checked and implemented accessibility (minimum Dynamic Text and VoiceOver)
• If needed, I updated documentation / comments for complex code and public methods
• If needed, added a backport comment (example @Mergifyio backport release/v120)

[mobiletest-ci-bot]

	Warnings
⚠️	Variable 'crossCircleFill' in Medium is out of alphabetical order.
⚠️	Variable 'cross' in Medium is out of alphabetical order.

	Messages
📖	Project coverage: 32.34%
📖	Edited 1 files
📖	Created 0 files

Client.app: Coverage: 30.96

File	Coverage
TabManagerImplementation.swift	29.19%	⚠️

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