Fix TestTelegramConfirmedRequest

[cyb3r4nt]

There were two different race conditions between logic in TestTelegramConfirmedRequest and TelegramAPIMock.GetUpdatesFunc and TelegramAPIMock.SendFunc:

• GetUpdatesFunc may start before token was fetched, then it produces empty telegramUpdate response, which causes assertions in SendFunc to fail.
• When token becomes used and removed from wait queue after successful login completion, then GetUpdatesFunc may be still called and new telegram update is created for same token. This breaks telegram update processing logic, and SendFunc gets called with the error parameter, which also breaks assertions.

Some of these failures were observed here: https://github.com/go-pkgz/auth/actions/runs/10632296696/job/29474964583?pr=214#step:6:778

=== RUN   TestTelegramUnconfirmedRequest
--- PASS: TestTelegramUnconfirmedRequest (0.12s)
=== RUN   TestTelegramConfirmedRequest
--- PASS: TestTelegramConfirmedRequest (0.03s)
=== RUN   TestTelegramLogout
panic: Fail in goroutine after TestTelegramConfirmedRequest has completed

goroutine 394 [running]:
testing.(*common).Fail(0xc000083ba0)
    /opt/hostedtoolcache/go/1.21.13/x64/src/testing/testing.go:952 +0x1b4
testing.(*common).Errorf(0xc000083ba0, {0xf4a4ad, 0x3}, {0xc000419ca0, 0x1, 0x1})
    /opt/hostedtoolcache/go/1.21.13/x64/src/testing/testing.go:1069 +0xaf
github.com/stretchr/testify/assert.Fail({0x11d5da0, 0xc000083ba0}, {0xc0000c6070, 0x6d}, {0x0, 0x0, 0x0})
    /home/runner/go/pkg/mod/github.com/stretchr/testify@v1.9.0/assert/assertions.go:363 +0x436
github.com/stretchr/testify/assert.Equal({0x11d5da0, 0xc000083ba0}, {0xe6df40?, 0x11d3460}, {0xe6df40?, 0xc000419b60?}, {0x0, 0x0, 0x0})
    /home/runner/go/pkg/mod/github.com/stretchr/testify@v1.9.0/assert/assertions.go:466 +0x3d8
github.com/go-pkgz/auth/v2/provider.TestTelegramConfirmedRequest.func3({0x11dbb50, 0xc000458eb0}, 0x1?, {0xf4aef0, 0x5})
    /home/runner/work/auth/auth/v2/provider/telegram_test.go:126 +0x116
github.com/go-pkgz/auth/v2/provider.(*TelegramAPIMock).Send(0xc0002c08c0, {0x11dbb50, 0xc000458eb0}, 0x12aa0131, {0xf4aef0, 0x5})
    /home/runner/work/auth/auth/v2/provider/telegram_moq_test.go:204 +0x279
github.com/go-pkgz/auth/v2/provider.(*TelegramHandler).processUpdates(0xc000272f20, {0x11dbb50, 0xc000458eb0}, 0xc0001b3740)
    /home/runner/work/auth/auth/v2/provider/telegram.go:173 +0xb7d
github.com/go-pkgz/auth/v2/provider.(*TelegramHandler).Run(0xc000272f20, {0x11dbb50, 0xc000458eb0})
    /home/runner/work/auth/auth/v2/provider/telegram.go:94 +0x5d2
github.com/go-pkgz/auth/v2/provider.setupHandler.func2()
    /home/runner/work/auth/auth/v2/provider/telegram_test.go:398 +0x66
created by github.com/go-pkgz/auth/v2/provider.setupHandler in goroutine 393
    /home/runner/work/auth/auth/v2/provider/telegram_test.go:397 +0x5eb
FAIL    github.com/go-pkgz/auth/v2/provider 5.645s
=== RUN   TestEmailSend
    email_test.go:15: 
--- SKIP: TestEmailSend (0.00s)
=== RUN   TestEmail_New
--- PASS: TestEmail_New (0.00s)
=== RUN   TestEmail_SendFailed