fix: update directory name for oauth policies and mobile policies

[niteshgupta90]

What does this PR do?

Update directory name for oauth policies and mobile policies

What issues does this PR fix or reference?

W-13098569

Functionality Before

ExtlClntAppOauthConfigurablePolicies had directory name oauthPolicies.
ExtlClntAppMobileConfigurablePolicies had directory name mobilePolicies.

Functionality After

ExtlClntAppOauthConfigurablePolicies now has directory name extlClntAppOauthPolicies.
ExtlClntAppMobileConfigurablePolicies now has directory name extlClntAppMobilePolicies.

[salesforce-cla]

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