RUM-5077: Fix units for dropped nodes

[jonathanmos]

What does this PR do?

We're sending ns instead of ms in the error msg for dropped nodes, but still write "ms" in the message itself. This pr fixes the units in the message.

Motivation

Wrong units in the dropped nodes error.

Additional Notes

Anything else we should know when reviewing?

Review checklist (to be filled by reviewers)

• [ ] Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• [ ] Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• [ ] Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

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

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #2107 +/- ## ========================================== Coverage ? 69.18% ========================================== Files ? 700 Lines ? 26165 Branches ? 4406 ========================================== Hits ? 18101 Misses ? 6864 Partials ? 1200 ``` | [Files](https://app.codecov.io/gh/DataDog/dd-sdk-android/pull/2107?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | Coverage Δ | | |---|---|---| | [...nreplay/internal/async/RecordedDataQueueHandler.kt](https://app.codecov.io/gh/DataDog/dd-sdk-android/pull/2107?src=pr&el=tree&filepath=features%2Fdd-sdk-android-session-replay%2Fsrc%2Fmain%2Fkotlin%2Fcom%2Fdatadog%2Fandroid%2Fsessionreplay%2Finternal%2Fasync%2FRecordedDataQueueHandler.kt&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-ZmVhdHVyZXMvZGQtc2RrLWFuZHJvaWQtc2Vzc2lvbi1yZXBsYXkvc3JjL21haW4va290bGluL2NvbS9kYXRhZG9nL2FuZHJvaWQvc2Vzc2lvbnJlcGxheS9pbnRlcm5hbC9hc3luYy9SZWNvcmRlZERhdGFRdWV1ZUhhbmRsZXIua3Q=) | `97.50% <ø> (ø)` | |