CMCL-0000: Add message banner for Cinemachine 2

[fatimah-mf-unity]

Purpose of this PR

Add message banner for status of Cinemachine 2 and 3 in Unity 6.5+.

JIRA: DOCG-9097

[cla-assistant-unity]

All committers have signed the CLA.

[u-pr]

💡 Harness Review

The shared deprecation notice is present on every published manual/API page in the package (with the navigation file correctly excluded), and the include target and relative references are consistent across the change.

_{Reviewed commit b26c7df}

_{🤖 Helpful? 👍/👎}

[codecov-github-com]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@               Coverage Diff                @@
##           release/2.10    #1123      +/-   ##
================================================
- Coverage         25.17%   25.09%   -0.08%     
================================================
  Files               137      137              
  Lines             20216    20216              
================================================
- Hits               5089     5073      -16     
- Misses            15127    15143      +16     

Flag	Coverage Δ
cinemachine_MacOS_2022.3	?
cinemachine_MacOS_2022.3_project	?
cinemachine_MacOS_6000.0	?
cinemachine_MacOS_6000.0_project	?
cinemachine_MacOS_6000.3	?
cinemachine_MacOS_6000.3_project	?
cinemachine_MacOS_6000.4	?
cinemachine_MacOS_6000.4_project	?
cinemachine_MacOS_6000.5	?
cinemachine_MacOS_6000.5_project	?
cinemachine_MacOS_6000.6	?
cinemachine_MacOS_6000.6_project	?
cinemachine_Ubuntu_6000.0	?
cinemachine_Ubuntu_6000.0_project	?
cinemachine_Ubuntu_6000.3	?
cinemachine_Ubuntu_6000.3_project	?
cinemachine_Ubuntu_6000.4	?
cinemachine_Ubuntu_6000.4_project	?
cinemachine_Ubuntu_6000.5	?
cinemachine_Ubuntu_6000.5_project	?
cinemachine_Ubuntu_6000.6	?
cinemachine_Ubuntu_6000.6_project	?
cinemachine_Windows_2022.3	15.58% <ø> (ø)
cinemachine_Windows_2022.3_project	25.07% <ø> (-0.06%)	⬇️
cinemachine_Windows_6000.0	15.58% <ø> (ø)
cinemachine_Windows_6000.0_project	25.07% <ø> (ø)
cinemachine_Windows_6000.3	15.58% <ø> (ø)
cinemachine_Windows_6000.3_project	25.07% <ø> (ø)
cinemachine_Windows_6000.4	15.58% <ø> (ø)
cinemachine_Windows_6000.4_project	25.07% <ø> (ø)
cinemachine_Windows_6000.5	15.58% <ø> (ø)
cinemachine_Windows_6000.5_project	25.07% <ø> (ø)
cinemachine_Windows_6000.6	15.64% <ø> (+0.06%)	⬆️
cinemachine_Windows_6000.6_project	25.07% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

see 4 files with indirect coverage changes

ℹ️ Need help interpreting these results?

[sebastienduverne]

Thank you! 👍