Cherry pick browser request validation improvements (#59045)

Cherry pick #58553 #58648 #59042

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Signed-off-by: Richo Healey <richo@anyscale.com>
Signed-off-by: Edward Oakes <ed.nmi.oakes@gmail.com>
Co-authored-by: richo-anyscale <richo@anyscale.com>
Co-authored-by: Lonnie Liu <95255098+aslonnie@users.noreply.github.com>

change version to 2.52.1 (#59049)

for 2.52.1 release

Signed-off-by: elliot-barn <elliot.barnwell@anyscale.com>

[core] Cherry pick token authentication UX improvements (#58831)

Cherry pick: #58737

Signed-off-by: sampan <sampan@anyscale.com>
Signed-off-by: Edward Oakes <ed.nmi.oakes@gmail.com>
Co-authored-by: Sampan S Nayak <sampansnayak2@gmail.com>
Co-authored-by: sampan <sampan@anyscale.com>

Fixes to tests (#58317)

lint on code format and cherrypick #58215

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Signed-off-by: Lonnie Liu <lonnie@anyscale.com>

[core][cherry-pick] RDT NIXL Limitations + Throw Exception (#58159)

## Description
Cherry-picking #58063 to throw an exception when trying to double send
the same ref before gc because it can trigger a NIXL error. Also adding
documentation for this.

Signed-off-by: Dhyey Shah <dhyey2019@gmail.com>
Signed-off-by: Qiaolin-Yu <liin1211@outlook.com>
Signed-off-by: Qiaolin Yu <liin1211@outlook.com>
Co-authored-by: Qiaolin Yu <liin1211@outlook.com>
Co-authored-by: Stephanie Wang <smwang@cs.washington.edu>

[cherry-pick] [core] Fix deadlock when cancelling stale requests on i…

…n-order actors (#57746) (#57768)

## Description
Cherry picking #57746

Signed-off-by: dayshah <dhyey2019@gmail.com>

[DOC-127] Cherry-pick (#54254): MVP for OSS Ray labels (#57547)

(cherry picked from commit 44a9732)

Co-authored-by: Douglas Strodtman <douglas@anyscale.com>

2.49.2 version change (#56501)

Signed-off-by: Lonnie Liu <lonnie@anyscale.com>

[data] Cherry pick data fixes for 2.49.1 (#56058)

Cherry pick two fixes for ray data (from
#55854 and
#55926).

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Signed-off-by: iamjustinhsu <jhsu@anyscale.com>
Signed-off-by: Alexey Kudinkin <alexey.kudinkin@gmail.com>
Signed-off-by: Matthew Owen <mowen@anyscale.com>
Co-authored-by: iamjustinhsu <140442892+iamjustinhsu@users.noreply.github.com>
Co-authored-by: Alexey Kudinkin <alexey.kudinkin@gmail.com>

[Core] Expose Default Fields in the Task Json Message (#55765) (#55784)

This PR fixed 2 issues we found in the task event pipeline with
additional tests added:
1. When converting the task events to json, add the option to include
the fields with default values
2. A typo in generating the add event response when the http endpoint is
not configured.

Signed-off-by: Mengjin Yan <mengjinyan3@gmail.com>