fix[react-native]: pass consistent UA - OKTA-296091

[shuowu]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines
• [] Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Adding Tests
• Build related changes
• CI related changes
• Documentation changes
• Other... Please describe:

What is the current behavior?

okta-react-native currently depends on different upstream sdks to make HTTP request, which end up with different UAs be sent out without react-native info.

Issue Number: N/A
OKTA-296091

What is the new behavior?

Use following pattern to set UA in headers

@okta/okta-react-native/${version} $UPSTREAM_SDK react-native/${version} ${Platform.OS}/${Platform.Version}

Android

ios

Does this PR introduce a breaking change?

• Yes
• No

Other information

Reviewers

[FeiChen-okta]

LGTM

[IldarAbdullin-okta]

iOS part looks good!