(js) Remove comments pertaining to auto-generation in Schema and Connector

[Zerryth]

Fixes microsoft/botframework-sdk#5887, partially, for JS

Description

Files in botframework -schema & -connector are no longer auto-generated

Removing

/*
 * Code generated by Microsoft (R) AutoRest Code Generator.
 * Changes may cause incorrect behavior and will be lost if the code is
 * regenerated.
 */

And replacing with the standard copyright header

[coveralls]

Pull Request Test Coverage Report for Build 472644888

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 67 unchanged lines in 14 files lost coverage.
• Overall coverage increased (+0.2%) to 84.313%

---

Files with Coverage Reduction	New Missed Lines	%
libraries/botframework-connector/src/connectorApi/connectorClientContext.ts	1	92.0%
libraries/botframework-connector/src/teams/teamsConnectorClientContext.ts	1	69.23%
libraries/botframework-connector/src/tokenApi/tokenApiClientContext.ts	1	84.0%
libraries/botframework-connector/src/auth/appCredentials.ts	2	92.73%
libraries/botframework-connector/src/tokenApi/operations/botSignIn.ts	2	80.0%
libraries/botframework-connector/src/auth/channelValidation.ts	4	79.55%
libraries/botframework-connector/src/auth/enterpriseChannelValidation.ts	4	82.61%
libraries/botframework-connector/src/connectorApi/operations/conversations.ts	4	87.5%
libraries/botframework-connector/src/auth/skillValidation.ts	5	91.67%
libraries/botframework-connector/src/tokenApi/operations/userToken.ts	5	68.75%

Totals
Change from base Build 472630912:	0.2%
Covered Lines:	17724
Relevant Lines:	20078

---

💛 - Coveralls

[Zerryth]

/azp run BotBuilder-JS-CI-node12-yaml

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).