[llvm] [mlir] [mlir] Add mlir-opt-repl: interactive MLIR pass pipeline explorer and MCP server (PR #203796)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Linux-->
# :penguin: Linux x64 Test Results

* 177200 tests passed
* 2571 tests skipped
* 4 tests failed

## Failed Tests
(click on a test name to see its output)

### MLIR
<details>
<summary>MLIR.mlir-opt-repl/conftest.py</summary>

```
Test has no 'RUN:' line
```
</details>
<details>
<summary>MLIR.mlir-opt-repl/test_cli_and_edge_cases.py</summary>

```
Test has no 'RUN:' line
```
</details>
<details>
<summary>MLIR.mlir-opt-repl/test_mcp.py</summary>

```
Test has no 'RUN:' line
```
</details>
<details>
<summary>MLIR.mlir-opt-repl/test_repl.py</summary>

```
Test has no 'RUN:' line
```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/203796