adding getSecret helper to az namespace for bicepparam files

[polatengin]

Contributing a feature

• I have opened a new issue for the proposal, or commented on an existing one, and ensured that the Bicep maintainers are good with the design of the feature being implemented
• I have included "Fixes #{issue_number}" in the PR description, so GitHub can link to the issue and close it when the PR is merged
• I have appropriate test coverage of my new feature

Fixes #10652

Design Proposal for the getSecret() support in .bicepparam files can be found on; #10652 (comment)

getSecret() helper is added to az namespace, so, it can be used in .bicepparam files as;

param sqlPwd = getSecret('<subscriptionId>', '<resourceGroupName>', '<keyVaultName>', '<secretName>')

or, with the az namespace alias

param webPwd = az.getSecret('<subscriptionId>', '<resourceGroupName>', '<keyVaultName>', '<secretName>', '<secretVersion>')

I added tests to make sure the functionality is working as expected. IntegrationTests and UnitTests projects are passing;

Cli.IntegrationTests

Core.IntegrationTests

Decompiler.IntegrationTests

LangServer.IntegrationTests

Cli.UnitTests

Core.UnitTests

Decompiler.UnitTests

LangServer.UnitTests

Microsoft Reviewers: Open in CodeFlow

Microsoft Reviewers: codeflow:open?pullrequest=#11236

[anthony-c-martin]

[github-actions]

Test Results (win-x64)

       33 files  ±0         33 suites  ±0   31m 51s ⏱️ - 1m 18s
10 184 tests +3  10 184 ✔️ +3  0 💤 ±0  0 ❌ ±0 
12 399 runs  +3  12 399 ✔️ +3  0 💤 ±0  0 ❌ ±0 

Results for commit 136c0c2. ± Comparison against base commit 2499ee5.

[github-actions]

Test Results (linux-musl-x64)

       33 files  ±0         33 suites  ±0   30m 27s ⏱️ - 4m 37s
10 172 tests +3  10 172 ✔️ +3  0 💤 ±0  0 ❌ ±0 
12 388 runs  +3  12 388 ✔️ +3  0 💤 ±0  0 ❌ ±0 

Results for commit 136c0c2. ± Comparison against base commit 2499ee5.

[github-actions]

Test Results (osx-x64)

       33 files  ±0         33 suites  ±0   1h 27m 9s ⏱️ - 19m 25s
10 176 tests +3  10 176 ✔️ +3  0 💤 ±0  0 ❌ ±0 
12 392 runs  +3  12 392 ✔️ +3  0 💤 ±0  0 ❌ ±0 

Results for commit 136c0c2. ± Comparison against base commit 2499ee5.

[github-actions]

Test Results (linux-x64)

       33 files  ±0         33 suites  ±0   33m 47s ⏱️ + 7m 30s
10 172 tests +3  10 172 ✔️ +3  0 💤 ±0  0 ❌ ±0 
12 388 runs  +3  12 388 ✔️ +3  0 💤 ±0  0 ❌ ±0 

Results for commit 136c0c2. ± Comparison against base commit 2499ee5.