Patches from main to r1.18.0 for Virtual Parallel (#6592)

* Add interleaved pp support (#6498)

* Add support for Virtual Pipeline Parallel conversion

Signed-off-by: smajumdar <titu1994@gmail.com>

* Add support for Virtual Pipeline Parallel conversion

Signed-off-by: smajumdar <titu1994@gmail.com>

* Switch to megatron core

Signed-off-by: smajumdar <titu1994@gmail.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Signed-off-by: smajumdar <titu1994@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
(cherry picked from commit 8929871)

* Add patches for Virtual Parallel conversion (#6589)

* Add patches for Virtual Parllel conversion

Signed-off-by: smajumdar <titu1994@gmail.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Signed-off-by: smajumdar <titu1994@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
(cherry picked from commit 1d813a3)