…n_in_progress: Interaction is currently in progress." (microsoft#1084)

### Motivation and Context
<!-- Thank you for your contribution to the semantic-kernel repo!
Please help reviewers and future users, providing the following
information:
  1. Why is this change required?
  2. What problem does it solve?
  3. What scenario does it contribute to?
  4. If it fixes an open issue, please link to the issue here.
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Issue Banner on Co-pilot start up: "Unable to load chats. Details:
interaction_in_progress: Interaction is currently in progress."

This error occurs when another MSAL interactive API call is currently in
progress -- e.g., we are requesting a token before the previous token
request has completed. Per the [MSAL React
documentation](https://github.com/AzureAD/microsoft-authentication-library-for-js/blob/dev/lib/msal-react/docs/errors.md#interaction_in_progress),
the solution is to check if another interaction is in progress and wait
until it's done. We already do this when acquiring tokens for skills (in
`TokenHelper.ts`), so we should use the same code to acquire the token
for the SKaaS backend.

### Description
<!-- Describe your changes, the overall approach, the underlying design.
These notes will help understanding how your code works. Thanks! -->
- Pipe MSAL's `inProgress` indicator into all calls to
`AuthHelper.getSKaaSAccessToken()`
- Change `AuthHelper.getSKaaSAccessToken()` to call
`TokenHelper.getAccessTokenUsingMsal()`, which already handles the
`interaction_in_progress` error

### Contribution Checklist
<!-- Before submitting this PR, please make sure: -->
- [ ] The code builds clean without any errors or warnings
- [ ] The PR follows SK Contribution Guidelines
(https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
- [ ] The code follows the .NET coding conventions
(https://learn.microsoft.com/dotnet/csharp/fundamentals/coding-style/coding-conventions)
verified with `dotnet format`
- [ ] All unit tests pass, and I have added new tests where possible
- [ ] I didn't break anyone 😄

---------

Co-authored-by: Teresa Hoang <125500434+teresaqhoang@users.noreply.github.com>

…n_in_progress: Interaction is currently in progress." (microsoft#1084)

### Motivation and Context
<!-- Thank you for your contribution to the semantic-kernel repo!
Please help reviewers and future users, providing the following
information:
  1. Why is this change required?
  2. What problem does it solve?
  3. What scenario does it contribute to?
  4. If it fixes an open issue, please link to the issue here.
-->
Issue Banner on Co-pilot start up: "Unable to load chats. Details:
interaction_in_progress: Interaction is currently in progress."

This error occurs when another MSAL interactive API call is currently in
progress -- e.g., we are requesting a token before the previous token
request has completed. Per the [MSAL React
documentation](https://github.com/AzureAD/microsoft-authentication-library-for-js/blob/dev/lib/msal-react/docs/errors.md#interaction_in_progress),
the solution is to check if another interaction is in progress and wait
until it's done. We already do this when acquiring tokens for skills (in
`TokenHelper.ts`), so we should use the same code to acquire the token
for the SKaaS backend.

### Description
<!-- Describe your changes, the overall approach, the underlying design.
These notes will help understanding how your code works. Thanks! -->
- Pipe MSAL's `inProgress` indicator into all calls to
`AuthHelper.getSKaaSAccessToken()`
- Change `AuthHelper.getSKaaSAccessToken()` to call
`TokenHelper.getAccessTokenUsingMsal()`, which already handles the
`interaction_in_progress` error

### Contribution Checklist
<!-- Before submitting this PR, please make sure: -->
- [ ] The code builds clean without any errors or warnings
- [ ] The PR follows SK Contribution Guidelines
(https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
- [ ] The code follows the .NET coding conventions
(https://learn.microsoft.com/dotnet/csharp/fundamentals/coding-style/coding-conventions)
verified with `dotnet format`
- [ ] All unit tests pass, and I have added new tests where possible
- [ ] I didn't break anyone 😄

---------

Co-authored-by: Teresa Hoang <125500434+teresaqhoang@users.noreply.github.com>