[action] [PR:23814] Add buffer profile 100Gb/500m for Arista-7060X6-64PE-B-P32O64 (sonic-net#1561)

<!--
Please make sure you've read and understood our contributing guidelines:
     https://github.com/Azure/SONiC/blob/gh-pages/CONTRIBUTING.md

** Make sure all your commits include a signature generated with `git
commit -s` **

If this is a bug fix, make sure your description includes "fixes #xxxx",
or
     "closes #xxxx" or "resolves #xxxx"

     Please provide the following information:
-->

#### Why I did it
This PR is to update
[pg_profile_lookup.ini](https://github.com/sonic-net/sonic-buildimage/compare/master...bingwang-ms:add_buffer_pro_100000_500m?expand=1#diff-bb7f3b2bac0a04eee5a3fa4057b6a4793a5aebb3b558be1c57aa2ca6b3bd67c2)
to support 100GB link speed and 500m cable length.

##### Work item tracking
- Microsoft ADO **34591589**:

#### How I did it
Update `pg_profile_lookup.ini` to support 100Gb link speed. The buffer
configuration is reused from 400Gb link speed.

#### How to verify it
The change is verified by deploying it on a physical device.
<!--
If PR needs to be backported, then the PR must be tested against the
base branch and the earliest backport release branch and provide tested
image version on these two branches. For example, if the PR is requested
for master, 202211 and 202012, then the requester needs to provide test
results on master and 202012.
-->

#### Which release branch to backport (provide reason below if selected)

<!--
- Note we only backport fixes to a release branch, *not* features!
- Please also provide a reason for the backporting below.
- e.g.
- [x] 202006
-->

- [ ] 202205
- [ ] 202211
- [ ] 202305
- [ ] 202311
- [ ] 202405
- [ ] 202411
- [x] 202505

#### Tested branch (Please provide the tested image version)

<!--
- Please provide tested image version
- e.g.
- [x] 20201231.100
-->

- [ ] <!-- image version 1 -->
- [ ] <!-- image version 2 -->

#### Description for the changelog
<!--
Write a short (one line) summary that describes the changes in this
pull request for inclusion in the changelog:
-->

<!--
Ensure to add label/tag for the feature raised. example - PR#2174 under
sonic-utilities repo. where, Generic Config and Update feature has been
labelled as GCU.
-->
Update `pg_profile_lookup.ini` to support 100Gb link speed.
#### Link to config_db schema for YANG module changes
<!--
Provide a link to config_db schema for the table for which YANG model
is defined
Link should point to correct section on
https://github.com/Azure/sonic-buildimage/blob/master/src/sonic-yang-models/doc/Configuration.md
-->
No db schema change
#### A picture of a cute animal (not mandatory but encouraged)

Author: bingwang-ms

device/arista/x86_64-arista_7060x6_64pe_b/Arista-7060X6-64PE-B-P32O64/pg_profile_lookup.ini

@@ -2,4 +2,5 @@
 # speed cable size    xon  xoff threshold xon_offset
 400000  30m  8636    0    425958  0         3556
 400000  500m 8636    0    1136396 0         3556
+100000  500m 8636    0    1136396 0         3556
 800000  5m   8636    0    724662  0         3556